Seared in a screaming hot cast iron, this blackened chicken gets its bold char from my homemade Cajun spice blend (1.1g net carbs and 36.4g protein). Raw to perfectly charred in 18 minutes, and it tops my salads and tacos weekly.
I started making this back when I first went keto in 2012, and it’s still one of the recipes I come back to the most. A thick coat of Cajun spices pressed into thin chicken breast, then seared hard in a hot skillet until the outside chars and the inside stays juicy. That’s it. No complicated technique, no long ingredient list.
What is blackened chicken?
Blackening is a Cajun cooking technique where you coat a protein in a heavy spice mixture, then sear it in a ripping hot pan until the spices char. Not burn. There’s a difference. The fat from the cooking oil bonds with the spices at high heat, creating this dark, smoky crust that looks intense but tastes incredible.
I use a homemade blend of smoked paprika, salt, cumin, thyme, onion powder, black pepper, and cayenne. I always reach for smoked paprika over regular because it doubles down on that smoky depth. The cayenne gives it heat, but you control how much (or skip it entirely).
The key move is butterflying the chicken breasts so they’re thin and even. Thin chicken means fast, even cooking and more surface area for that Cajun crust. I sear each piece for about a minute per side in my cast iron, then transfer to a 350 degree oven for 5-8 minutes. The oven finish is what keeps the chicken tender without overcooking it on the stovetop. I’ve also done this with thighs, and they’re more forgiving because of the extra fat content. Same technique, just pound them to even thickness first. Chicken tenderloins work too when I want a quicker cook, almost like tenders with a Cajun kick.
The same spice blend works on other proteins too. I use it on shrimp (about 90 seconds per side, pull right when they curl) and on salmon fillets with a slightly hotter oven temp. I keep a jar of this in my spice cabinet so I can grab it whenever I need a fast keto dinner. If you’re looking for another crispy-coated chicken recipe, my chicken katsu takes a completely different approach but hits that same craving.
This is one of those recipes I lean on for weeknight dinners because it pairs with practically anything. I tuck it into cheese taco shells, serve it alongside garlic butter shrimp for a surf-and-turf plate, or chop it over a creamy Alfredo with low carb noodles. The charred spice crust against a rich cream sauce is a combination I keep going back to. Loaded with 36g of protein per serving, it fits without any modifications. And leftovers reheat well for meal prep throughout the week, which is how I usually use it.
Cajun blackened chicken seasoning
The spice blend is what makes this recipe work, and I’ve landed on a ratio I really like after years of tweaking it. My mix uses smoked paprika, cumin, thyme, onion powder, salt, black pepper, and cayenne. Some Cajun blends include oregano or dried parsley, and you can toss those in too, but I find the core spices do the heavy lifting.
Smoked paprika is the one I won’t skip. Regular paprika is fine in other recipes, but here it’s the difference between a flat spice crust and one with real depth. I buy mine in bulk because I go through it fast. I make a triple or quadruple batch of the blend and store it in an airtight container. It keeps for months and saves me a step on busy weeknights.
To get the seasoning to actually stick, I spray the chicken with a thin coat of avocado oil first. Some people mix the oil directly into the spices to make a paste, and that works too. Use an oil with a high smoke point (avocado or canola). I don’t use olive oil here because it oxidizes at the temperatures we’re working with.
How spicy is this recipe?
It can be. The cayenne is what brings the heat, and I use the full amount called for in the recipe because my family likes it. If you’re sensitive to spice, start with a pinch of cayenne or leave it out entirely. The rest of the seasoning still delivers plenty of flavor without the kick.
How to butterfly chicken breast
I butterfly the chicken so every piece is the same thickness for even cooking. If one side is thick and the other is thin, you end up with dry edges and a raw center. Here’s how I do it:
Place your hand flat on top of the chicken breast to hold it steady. Keep your fingers up and away from where you’re cutting.
With a sharp knife, start at the thick end and cut horizontally through the breast, keeping the blade parallel to the cutting board.
Cut all the way through to separate into two thin pieces.
In this recipe, I cut completely through (not leaving a hinge) so I get two separate pieces from each breast. If they’re still uneven after cutting, put them in an open zip-top bag and pound them with a rolling pin or meat mallet until they’re uniform. Takes 30 seconds and makes a real difference in how evenly the chicken cooks.
What to serve with blackened chicken
Since this cooks so fast, I look for sides that come together just as quickly. Here’s what I rotate through most weeks:
I throw veggies on a sheet pan while the chicken finishes in the oven. Timing lines up perfectly. A simple cucumber and tomato salad works too when I don’t want to heat up another appliance.
For something more filling, I slice it into smashed dumpling tacos or chop it over a stir fry with whatever vegetables I have. The Cajun seasoning crosses over well into Asian-inspired bowls.
A recent favorite in my house is slicing the chicken over a creamy Alfredo with shirataki noodles and wilted spinach. The charred spice crust against a rich cream sauce is a combination I keep going back to. If you like creamy garlic paprika shrimp, this Cajun version over pasta hits the same notes.
Leftovers go into salads, on top of cauliflower rice, or mixed into scrambled eggs for breakfast. The spices hold their flavor for days in the fridge.
How to store and meal prep
I meal prep this almost every Sunday. It’s one of the easiest proteins to batch cook because the method is so straightforward, and the chicken holds up well in the fridge all week.
Refrigerator storage
Store cooked chicken in an airtight container for up to 4-5 days in the refrigerator. I slice mine before storing so it’s ready to grab and toss into salads or wraps.
Freezer storage
You can freeze cooked chicken for up to 2-3 months in a freezer-safe bag with the air pressed out. I’ve found that beyond 3 months the texture starts to get a little dry when you reheat it, so I try to use it sooner.
Meal prep tips
Always cook the chicken before storing it. I’ve tried seasoning raw chicken the night before and refrigerating it, but moisture builds up on the surface overnight, and that moisture kills the sear. You won’t get that charred Cajun crust if the chicken is wet going into the pan. Cook it first, store it cooked, and reheat when you’re ready to eat. To reheat, I warm the sliced chicken in a skillet over medium heat with a splash of chicken broth so the steam heats it through without stripping the moisture out. The microwave works in a pinch, 30 seconds at a time and covered, but the spice crust gets a little soft that way.
How to make blackened chicken
I keep this method simple on purpose. The whole thing comes down to three moves: season, sear, oven finish.
Make the Cajun spice blend: Combine smoked paprika, salt, ground cumin, dried thyme, onion powder, black pepper, and cayenne pepper in a small bowl.
Butterfly and prep the chicken: Slice each chicken breast horizontally to create two thin, even pieces. Pat them dry (this matters for the crust), then spray both sides with a high smoke point cooking oil so the spices grip the surface.
Sear in a screaming hot skillet: I use my cast iron, heated over high for a full 5 minutes before anything goes in. No oil in the pan. No butter. Just dry heat. Sear each piece for about a minute per side until you see that dark, charred crust forming.
Finish in the oven: Transfer to a parchment-lined baking sheet (or keep it in the cast iron if it's oven-safe) and bake at 350 degrees for 5-8 minutes until internal temp hits 160 degrees. Let it rest 3 minutes before slicing.
Preheat oven to 350 °F. Place a sheet of parchment paper or foil on a baking tray (unless using a cast-iron skillet or oven-proof stainless steel skillet). Set aside. In a small bowl, combine smoked paprika, salt, cumin, thyme, onion powder, black pepper and cayenne pepper.
For this step
4 teaspoons smoked paprika
1 tablespoon salt
1 teaspoon ground cumin
1 teaspoon dried thyme
1 teaspoon onion powder
1 teaspoon black pepper
¼ teaspoon cayenne pepper, if using
2
Heat the skillet
Heat a cast-iron or stainless steel skillet over high heat until piping hot or it starts to smoke. DO NOT add oil or butter to the skillet.
3
Cut chicken into thin, even pieces
Cut the chicken breast in half (like butterflying it) to create two thin slices of chicken breast. To do this, put your hand on the smooth side of the chicken breast to stabilize it as you cut. Using a sharp knife, start at the thick end of the breast, cut horizontally into the breast, running the knife parallel to the cutting board. Pat dry with a paper towel.
For this step
2 large skinless, boneless chicken breasts
4
Coat chicken
Spray the chicken breasts on both sides with cooking oil. Transfer Cajun seasoning to a small plate. Working with one slice of chicken at a time, transfer to the plate to coat the seasoning on all sides of the chicken.
5
Blacken the chicken
Place chicken into the hot skillet leaving space in between each piece of chicken. (Don’t overcrowd the skillet). Cook for 1 minute, flip and cook for a minute on the other side or until a charred crust has formed. Transfer to the prepared baking sheet or keep in the skillet if using cast iron or an ovenproof skillet.
6
Oven bake
Bake in the oven at 350 °F for 5-8 minutes or until the internal temp is 160 °F. Rest for 3 minutes before slicing.
Nutrition
Per serving: 1/4 of recipe
Calories
270
Fat
12.3g
Protein
36.4g
Total carbs
2.1g
Net carbs
1.1g
Nutrition is an estimate calculated from the ingredients listed. Brands vary, so check labels if you track closely.
Frequently Asked Questions
Can I use a non-stick pan instead of cast iron?
I wouldn't. Non-stick coatings can't handle the high heat you need for a proper char, and most manufacturers warn against using them above medium-high. I've tried it and the spices just sort of sat there instead of blackening. A cast iron skillet or stainless steel pan is what you want for this.
How do I make blackened salmon with this seasoning?
I press the seasoning into the flesh side, sear that side down for 2 minutes in the same screaming hot pan, flip, then finish in the oven at 400 degrees for another 4-5 minutes. I've found salmon needs a slightly hotter oven than the chicken to get the center right. The blend works on shrimp too, and I cover that timing up in the post.
Can I make this in the air fryer?
I've tested this in the air fryer at 400 degrees for about 8-10 minutes, flipping halfway through. It works, but the crust isn't the same. You get a dry-roasted char rather than the tight, seared bark you get from cast iron. The air fryer version is more convenient when I'm cooking a bigger batch and don't want to sear in rounds. I still prefer the skillet method when I have the time.
What's the difference between blackened seasoning and Cajun seasoning?
They're close cousins. My blackened seasoning is specifically built to char at high heat, so I lean heavy on smoked paprika and keep the blend dry. Traditional Cajun seasoning can include garlic powder, oregano, dried parsley, and sometimes onion flakes that don't hold up as well at screaming-hot temperatures. I use my blackened blend when I'm searing hard and fast, and a standard Cajun blend when I'm doing a slower cook like a chicken noodle skillet or stew.
Is blackened chicken healthy and keto friendly?
Mine is. Each serving comes in at 270 calories with 36.4g of protein and 1.1g net carbs, so it fits my keto macros without any modifications. The coating is just spices, no sugar and no flour, which also keeps it naturally gluten free. The full nutrition breakdown is on the recipe card below.
Couldn’t figure out why other blackened chicken recipes tasted flat until I spotted the thyme. Not a typical Cajun ingredient, but it’s doing real work here. Four stars because the salt runs hot for me, but the cast iron char? That’s exactly what the others all missed.
You caught the thing most people miss, Aisha. The thyme is what keeps it from tasting like plain paprika heat. On the salt, I’d cut it to 2 teaspoons next batch. It still chars the same.
The 36g protein stopped me scrolling. I’ve torched cast iron chicken before trying to get real char on it, raw inside every time. Cut it thin like the recipe says and the high heat actually makes sense.
My wife normally avoids anything with real heat but she finished the whole plate without once mentioning the spice, which is the quietest compliment she gives. Good weeknight chicken.
Tried probably six blackened chicken recipes before this one and most of them are just spiced chicken. The screaming hot cast iron is the actual secret and I genuinely don’t understand why every other recipe buries that detail.
Beth, most recipes soft-pedal it because screaming hot sounds like a liability. I wait until the cast iron actually starts to smoke before adding the chicken, which panics people the first time they see it, but that’s where the char comes from.
Got back on keto in March after a rough few months and spent the first two weeks eating sad plain chicken before I found this. Cast iron at full heat is what does it, the crust is nothing like what I was making before. Made it with the full cayenne. Exactly the dinner I didn’t think I could have on keto anymore.
My husband usually picks the cayenne out of everything but got through two pieces without saying a word about heat. Something about searing it in that screaming hot skillet seems to mellow the spice into the crust rather than sitting on top of it. Going in the weeknight rotation.
The char kind of seals the spice in place. That’s exactly why the pan has to be screaming hot before the chicken goes in, not just warm. Glad the husband passed.
I assumed bold, spicy food was just off the table when I started keto, so I’d been eating pretty sad chicken for a while. The first time the Cajun seasoning hit that screaming hot cast iron and the whole kitchen filled up, I knew I’d been making this harder on myself than it needed to be.
Cut the cayenne in half because I’m a spice wimp and it still hit SO hard from the smoked paprika. Had no idea it’d be that bold. Already planning a double batch.
Swapped the cooking spray for a thin layer of ghee before it hit the cast iron and the char has so much more depth. The smoked paprika really blooms differently in the fat. Worth the extra step.
I’ve never cooked chicken over high heat like that before, and I kept thinking I was about to set off the smoke alarm. But the char that formed was exactly what the recipe promised, this dark spiced bark that held all the way through the plate. The smoked paprika really does something here, I could smell it the second the chicken hit the skillet. I bumped the cayenne a little because we like heat in this house and you could taste it in every bite of the crust. Threw it over a salad for a weeknight dinner and I was picking pieces off before I even sat down. This is going in the weekly rotation. One question though: have you tried this seasoning on shrimp? I feel like it’d work great but I’m not sure if the pan timing would need to change.
Yeah, shrimp works great with this blend. About 90 seconds per side in the same screaming hot pan. They go rubbery fast so pull them right when they curl.
