Keto Roasted “Potatoes”
Published April 5, 2021 • Updated March 6, 2026
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Purple radishes are my secret weapon for keto roasted potatoes. I roast them until they're golden and crispy on the outside, tender on the inside, and my family genuinely thinks they're eating red potatoes. At just 1.8g net carbs per 100g, these low carb roasted potatoes are the real deal.
I never thought I’d be the person raving about radishes. Raw, they’re peppery and sharp. Nothing like a potato. But I roasted a batch back in 2018 on a whim, and everything changed. The bitterness disappeared completely, the texture softened, and what came out of my oven looked and tasted like roasted red potatoes.
These have become a staple in my house. I make them at least twice a week, sometimes more when I’m meal prepping. They come out warm, crispy on the edges, and savory all the way through. I love them as a side for dinner, but I eat them for breakfast too, right alongside bacon and eggs. Total comfort food without the carb crash.
The trick I’ve learned after making these dozens of times is patience. Radishes hold more water than potatoes, so they need longer in the oven than you’d expect. I roast mine for 40-45 minutes at 400 degrees, flipping halfway through. That extra time is what takes them from ‘still kind of radish-y’ to genuinely potato-like. If yours taste too peppery, they need more time. That raw radish bite only disappears with enough heat and enough patience.
I keep the recipe simple on purpose. Olive oil, salt, pepper, spread on a sheet pan. That’s it for the base. But when I want something more indulgent, I go the loaded route. I top them with crumbled bacon, shredded cheddar, a drizzle of ranch, and a little sour cream. My family fights over the loaded version. It’s our Friday night side dish and nobody misses regular potatoes.
If you think you don’t like radishes, I get it. I didn’t either. But roasting transforms them into something completely different. They absorb seasonings beautifully. I’ve done rosemary and garlic, parmesan with Italian herbs, even a little everything bagel seasoning. All good. The purple radishes look the most like red potatoes once roasted, which is why I prefer them, but any variety works.
These roasted radishes pair with just about anything. I serve them with bacon wrapped chicken tenders, beef and broccoli, or alongside grilled pork chops when I need an easy side. My kids think they’re eating red potatoes. They have no idea, and I’m not correcting them. Make extra because they’re just as good cold the next day straight from the fridge.
Missing potatoes on keto? I’ve got you covered with low carb swaps. Mashed turnips are my go-to when I want something creamy, and I keep a few other favorites in rotation depending on what I’m cooking.
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Ingredients
2 bundles of purple radishes, stems removed and diced -
1/4 cup olive oil
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2 teaspoons salt
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1 teaspoon pepper
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Optional: add rosemary, thyme, parsley for flavor
Step by Step Instructions
Step by Step Instructions
Nutrition disclaimer
The nutrition information provided is an estimate and is for informational purposes only. I am a Doctor of Pharmacy (Pharm.D.); however, this content is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always consult your physician or other qualified health provider before making any lifestyle changes or beginning a new nutrition program.
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Get My Macros + Recipes →Frequently Asked Questions
How do I make keto roasted radishes in an air fryer?
I started making these in my air fryer about six months ago and the results are even crispier than the oven. I toss the diced radishes in olive oil, salt, and pepper, then air fry at 380 degrees for 15-18 minutes, shaking the basket every 5 minutes. The edges get deeply golden and almost crunchy. I don't crowd the basket (I do two batches if I need to) because airflow is everything. The only downside is smaller batches, so when I'm feeding my whole family I still use the oven.
Can I use daikon radishes instead of purple radishes?
I've made this with daikon radishes several times and they work well. Daikon is milder in flavor and the pieces are larger since the root is bigger. I cut daikon into 1-inch cubes and roast them about 5 minutes longer than purple radishes. The texture comes out great, though they don't have that red potato look that purple radishes give you.
How do I make loaded roasted radishes with bacon and cheese?
This is my family's favorite version. I roast the radishes as usual, then top them straight from the oven with crumbled bacon, shredded cheddar, a drizzle of ranch dressing, and a dollop of sour cream. I pop them back in the oven for 2-3 minutes to melt the cheese. My kids request these on Friday nights and I look forward to them too.
Why do my roasted radishes still taste like radishes and not potatoes?
I had this exact problem the first few times. The answer is more time in the oven. When I pulled them at 20-25 minutes, they still had that raw radish bite. Now I roast mine for 40-45 minutes at 400 degrees, flipping halfway. That extra time lets the water evaporate and the peppery flavor completely disappears. If yours taste too radish-y, they just need more roasting time.
Why do my radishes steam instead of getting crispy?
I've seen this come up a lot and the fix is almost always pan crowding. I made this mistake early on too. When radishes are packed tight on the sheet pan, they steam each other instead of roasting. I spread mine in a single layer with space between each piece. If I'm making two bundles, I use two sheet pans. The other factor is time. I go the full 40-45 minutes at 400 degrees. Pulling them at 25 minutes gives you soft, pale radishes instead of golden crispy ones.
Can I freeze roasted radishes?
I tried freezing roasted radishes once and learned the hard way that they don't hold up. The high water content makes them mushy and waterlogged after thawing. I tested this twice and both times the texture was off. My advice is to make them fresh or store leftovers in the fridge for up to 3-4 days. They reheat well in the oven at 400 degrees for 8-10 minutes.
What seasonings work best on roasted radishes?
I rotate through a few favorites. My go-to is rosemary and garlic, tossed on before roasting. I also love a parmesan crust (I sprinkle grated parm in the last 5 minutes and let it get golden). Everything bagel seasoning is another one I come back to. For the crispiest coating, I've crushed pork rinds with parmesan and tossed the radishes in that before roasting. The pork rind version gets a crunchy exterior that's hard to beat.
Can I make these ahead for meal prep?
I make a double batch every Sunday for the week. They keep in the fridge for 3-4 days in an airtight container. When I reheat, I always use the oven (400 degrees, 8-10 minutes) because the microwave makes them soft. I've eaten them cold straight from the fridge too, which is surprisingly good as a snack. They're one of my easiest sides to prep because there's almost no hands-on time.
I was skeptical about the radish swap. I've tried a few cauliflower-based potato substitutes and they always carry this unmistakable brassica aftertaste that breaks the illusion no matter what you season them with. Radishes are peppery raw, so I figured roasted would be worse, not better. I was wrong. At 400 degrees, something happens around the 20-minute mark where the outside develops this golden crispiness that looks and behaves exactly like a roasted red potato, and the inside goes completely tender without turning to mush. I made a batch alongside a pot roast Sunday dinner and set them out without saying anything. My wife loaded hers with sour cream before I could tell her what she was eating. That settled it.
These are legitimately crispy and the texture is there, but the radish flavor doesn't completely disappear at 25 minutes the way the recipe implies. Smaller dice and pulling at 18-20 made a real difference for me. Still making them, just wish that note was in the original recipe.
I've made radish-based potato swaps a handful of times with mixed results. Most end up with that sharp radish bite even after roasting. These don't. Something about tossing them in oil and running the full 23-25 minutes at 400 mellows them out completely. Going to try adding rosemary to the next batch.
Rosemary is such a good call here. I add it rough-chopped in the last 8-10 minutes so it doesn't burn and turn bitter.
Made these last Sunday during the snowstorm and my family genuinely couldn't tell they weren't real potatoes, so I'm already planning to make them again this weekend. But here's my issue: I couldn't get the outsides to crisp up the way they look in your photos, even going the full 25 minutes at 400. They came out tender and flavorful but sort of pale and steamed-looking instead of golden. I think I might have crowded the pan because I was trying to fit 2 bundles onto one sheet (they were pretty packed in there). Would splitting into two trays fix this, or do I need to go higher on the temp or cook them longer? I really want to nail that crispy outside next time.
Crowded pan is part of it, but 25 minutes isn't nearly enough. I go 40-45 at 400 and flip once at the halfway point. Split the trays AND give them the full time - that's when the color actually happens.
I tried radishes in the cheeseburger soup. Liked them very much, they are more turnip like to me, but tasted more like the broth on the soup which was excellent.
That makes sense, radishes absorb whatever they're cooked in. Hadn't thought to try them in cheeseburger soup but I will now.
I tried these to substitute hash browns with my breakfast. I was surprised, very good.
Hash brown swap is underrated with these. They reheat well in the oven the next morning too if you want to make a batch ahead.
These were great!
The loaded version is even better if you haven't tried it yet. Bacon, cheddar, ranch straight out of the oven. My kids won't let me make them plain anymore.