Crunchy, golden keto apple fritters with a soft, buttery center, just 0.9g net carbs. Zucchini and concentrated apple extract bring the apple flavor; I tested the dough four times to get it right.
I’ve been making these for years, and they’re the recipe that convinced my family that keto baking could actually be good. Not “good for keto.” Just good. Crunchy on the outside, soft and cakey in the middle, with real fritter flavor from a combination of zucchini and apple extract that I stumbled onto by accident.
The classic glazed donut was the first keto donut I cracked, but these fritters are the ones I make most often. I use zucchini in place of apples to keep the carb count way down, and the trick works so well that nobody at my table has ever questioned it.
The zucchini is practically tasteless on its own, which is exactly the point. Peeled and finely diced, it takes on whatever flavor you throw at it. I pair it with concentrated apple extract, lemon juice, and cinnamon to recreate that tart granny-smith bite you’d expect from a traditional fritter. Chayote squash works as a substitute too, but I always reach for zucchini because it’s cheap and available everywhere. The texture holds up, the flavor is convincing, and one serving has a fraction of the carbs.
The dough comes together in about five minutes. Almond flour, protein powder (the real MVP for structure and lift), sweetener, baking powder, xanthan gum, and salt. I mix the wet ingredients separately (melted butter, nut milk, sour cream, water, one egg), fold everything together with the zucchini mixture, then drop spoonfuls into hot lard or avocado oil. The edges crisp up golden and almost crackle when you bite in. The inside stays soft and cakey. That contrast is what makes these worth the effort.
A quick note on frying: oil temperature controls whether these hold together or fall apart. When a reader told me hers disintegrated, I knew right away what went wrong. The oil was too hot. It also helps to let the dough rest for a minute after mixing so the xanthan gum has time to bind. If they start breaking apart the moment they hit the oil, lower your heat to medium and give them a full 3-5 minutes per side before flipping. I check by gently nudging the bottom with a spatula. If it lifts cleanly and looks golden, it’s ready to flip. I use this same patient approach for my churro donut holes too.
I finish mine with a cream glaze (confectioners sweetener, heavy cream, vanilla), but melted butter drizzled on top works just as well. Sometimes I skip the glaze entirely and eat them warm with just a dusting of cinnamon. Two of these with a hot cup of coffee is my idea of a low-carb breakfast.
Zucchini has a neutral flavor and a firm, apple-like texture when diced small, which is exactly why I reach for it in low-carb baking. When you toss it with apple extract, lemon juice, and cinnamon, you get something that looks and tastes like real apple chunks. My family doesn’t notice the difference.
I use this same zucchini trick in my keto chocolate zucchini muffins, and it works every time. Chayote squash is another option if you can find it at your grocery store, but zucchini is cheaper and more widely available.
If you’d rather use a real apple, you can. Just know the carb count goes up significantly. One cup of diced apple adds over 12g net carbs, so I’d keep the portion small and adjust your macros.
The apple extract that makes these work
The secret to getting real apple flavor without real apples is concentrated apple extract. I’ve tried several brands, and my favorite is the granny smith flavor from One-on-One Flavors. It’s the closest thing to a traditional fritter made with real granny smith apples, with that sharp, tart edge I think fritters need.
I’ve also tested their Fuji apple extract. It works, but it’s sweeter and rounder. Start with 1/4 teaspoon of extract and taste the zucchini mixture before adding more. You want it noticeable but not overpowering.
The link above gives you a discount on One-on-One Flavors extracts.
Why protein powder makes or breaks these
I’ve tested this recipe without protein powder, and the fritters come out flat and crumbly. Protein powder gives them structure and lift, almost like what gluten does in traditional donut dough. It also adds a subtle sweetness that rounds out the flavor.
I use unflavored or vanilla whey protein powder, but vegan protein powder works too. The key is using about 1/2 cup for this batch size. If you’re new to baking with protein powder, I’d suggest trying my single serve keto donut first to get a feel for how it behaves before scaling up to a full batch.
How I store the leftovers
This recipe makes 18 fritters, and unless you’re feeding a crowd, you’ll have leftovers. I keep mine in a paper bag at room temperature, which sounds odd, but it works. The paper wicks away moisture and keeps the outside crunchy while the inside stays soft.
If you need to reheat them, I skip the microwave (it makes them soggy) and use a dry skillet over medium heat for about a minute per side. That brings back the crisp. They’re great the next morning alongside a cup of coffee or a plate of keto French toast.
How to make keto apple fritters
Prep the "mock apples": Toss finely diced zucchini with cinnamon, lemon juice, and apple flavoring. This is what gives the fritters their apple taste without the carbs.
Mix the fritter dough: Combine almond flour, protein powder, sweetener, baking powder, xanthan gum, and salt. Then stir in nut milk, sour cream, melted butter, water, and an egg.
Fold in the zucchini mixture: Stir until everything is just combined.
Fry in lard or avocado oil over medium heat. I use about a 1/4 cup of dough per fritter. Flip once the bottom is golden brown (3-5 minutes), then fry the other side.
Let cool, then drizzle with cream glaze or melted butter.
In a small bowl, add finely diced zucchini, cinnamon, lemon juice and apple flavoring. Add more or less apple flavoring to taste. Mix and set aside.
For this step
1 zucchini, peeled & diced
1 teaspoon cinnamon
2 teaspoon lemon juice
1/4-1/2 teaspoon apple flavoring
2
Dry ingredients
Add the dry ingredients to a medium bowl. Mix until combined.
For this step
2 cups almond flour
1/2 cup unflavored or vanilla protein powder
3 tablespoons sugar-free sweetener
2 1/2 teaspoons baking powder
1 teaspoons xanthan gum
1 teaspoon salt
3
Add the wet ingredients
Mix in wet ingredients.
For this step
1/2 cup unsalted butter, melted
1/2 cup nut milk
1/4 cup sour cream
1/4 cup water
1 egg
4
Zucchini in
Fold in apple flavored zucchini mixture.
5
Lard & skillet
Add lard to a small non-stick skillet and heat to medium heat. Add enough lard to cover the donut almost halfway. Scoop about a 1/4 cup of the fritter dough into the skillet. You can swirl the oil in the pan to help coat the donuts as they cook. Flip once golden brown on the bottom (about 3-5 minutes) and fry the other side until golden brown.
6
Cool down
Remove from skillet and place on a paper towel or wire rack to cool.
7
Glaze
To make the apple fritter glaze, add confectioner’s Swerve, heavy cream and vanilla to a small bowl. Mix to combine. Microwave for 20 seconds to get a thin consistency if needed.
For this step
1/2 cup powdered sugar-free sweetener
2 tablespoons heavy cream
2 teaspoon vanilla extract
8
Drizzle it
Drizzle or dip the top of your apple fritter donut into the glaze and place on a wire rack to set.
Nutrition
Per serving: 1/18 of recipe
Calories
92
Fat
8.7g
Protein
2.2g
Total carbs
1.9g
Net carbs
0.9g
Nutrition is an estimate calculated from the ingredients listed. Brands vary, so check labels if you track closely.
Frequently Asked Questions
Can I bake or air fry these instead of deep frying?
I've only made these fried, and I think frying is the way to go. The hot oil is what gives them that crunchy, golden crust that makes a fritter a fritter. Baking or air frying would change the texture completely, and I don't think you'd get the same crackly outside. If you want a baked option, I'd try a different recipe entirely.
Can I substitute coconut flour for almond flour?
I haven't tested this recipe with coconut flour, so I can't guarantee the same results. Coconut flour absorbs way more liquid than almond flour, so if you try it, use about 1/4 cup of coconut flour for every cup of almond flour and increase the wet ingredients. I'd also add an extra egg. But honestly, I'd stick with almond flour here because the texture is dialed in.
Are apples keto?
In my experience, apples are too high in carbs to fit into a keto day comfortably. One cup of diced apple has over 12g net carbs, which is more than I want to spend on a single ingredient. That's why I use zucchini with apple extract instead. You get the flavor and texture without the carb load.
Can I freeze these for later?
I freeze them without the glaze and they hold up well. I spread the cooled fritters on a baking sheet, freeze until solid, then transfer to a freezer bag. They keep for about a month. To reheat, I thaw them in the fridge overnight and warm them in a dry skillet over medium heat until the outside crisps back up. I add fresh glaze right before serving.
These fritters were really good, though medium heat ran hot in my skillet & the outsides browned before the centers set. Lower heat fixed it, Annie, might be worth a note in the steps.
Peel the zucchini past any green, right down to the white flesh. The skin holds more moisture than the flesh, and in a dough this size it waters down the apple extract once everything comes together. I left it half-peeled on one batch and the flavor was noticeably weaker, center too soft. Full peel, small dice, then the lemon and cinnamon, and the extract lands where it should.
0.9 net carbs. I sat with that. Two years keto and apple fritters were not a gap I thought anyone was going to close, the ratio of batter and sugar and apple IS the recipe. Zucchini and extract sounds like a workaround that won’t hold. It holds. The edges fry up golden and the center is soft in a way I stopped expecting to find on keto. Made these four days ago. Already planning the next batch.
Vanessa, the skepticism is the right starting point for this one. I did four batches because I needed the texture to actually be there, not just passable. Already planning round two after four days is the answer I was hoping for.
Made these last night and lost half of them when I tried to flip them, they just fell apart in the lard. The ones I rescued actually tasted great. Did I make the pieces too big, or is there a way to tell when they’re set enough to flip without losing them?
so I’ve been doing a double batch every Sunday for a few weeks now and the thing I had to work out was the reheating situation, because fresh out of the oil they’re everything but day two in the microwave was honestly pretty sad, then I tried the air fryer at 350 for four minutes and they came back with that crust still on them, which I wasn’t expecting, so now I pack three or four and they actually hold up through the week.
Cinnamon hitting the lard has a smell that took me right back. Never thought keto could actually pull off apple fritters. The extract is what makes it work.
Cinnamon in lard is a smell that doesn’t exist in the butter version. The extract was the last thing I was still adjusting through all four testing batches – kept wanting to go heavier before I landed on that range.
Was not sold on the zucchini thing at all. Every other keto fritter I’ve tried just tastes like almond flour with ambitions, but the apple extract plus frying in lard actually pulled it off. The outside crunch is freaking real.
Lard was in my early test batches and the crunch was noticeably better. Holds temp when cold batter hits the oil, so the outside locks before it has a chance to soften.
Salted the zucchini and let it sit 10 minutes, then wrung it out before folding it in. The center on these went from okay to exactly what you want, no soggy middle, just that crunchy golden crust actually holding together. That step is non-negotiable for me now. Only real note: 1/4 teaspoon of apple flavoring is basically a whisper. I pushed it to 3/4 and it finally tasted like something.
My mom has written off every keto substitute I’ve made for three years. She ate one of these and asked what orchard the apples came from. Almost made me forget the outside could’ve been crispier.
Three years and now she wants orchard info. Oil needs to be fully at 350 before the first batch goes in, and don’t crowd them. Temp drops fast and that’s where the crust goes soft.
My son has been skeptical of everything I’ve made since the cauliflower rice incident, so I didn’t mention the zucchini. He finished his plate, asked if I’d gotten these somewhere, and when I told him they were made with zucchini he made the face. Then quietly grabbed another one. The apple flavoring and cinnamon are that convincing, and the crust fries up with this golden crunch that I think sealed the deal for him.
No lard in the house so I used coconut oil, figured why not. Crust still came out golden and crispy, just needed a couple extra minutes. Coconut actually pairs better with the apple and cinnamon than I expected. Used the full half teaspoon of apple flavoring and it came through without tasting fake. Dough was stickier than I expected, though. Wet hands helped a lot when shaping, not sure if that’s a xanthan gum thing but it worked. Might try lard next batch to see how the crunch compares.
Keto baking I’ve done plenty, but frying almond flour dough is new for me. The zucchini trick is clever. On the apple flavoring: should I start with the smaller amount and taste as I go, or does it mellow once fried?
My first batch came out flat on apple flavor, so I adjusted: full 1/2 teaspoon of apple flavoring plus an extra pinch of cinnamon in the zucchini soak. Big difference once fried. Also, the dough spreads more than you’d expect in the skillet, so I portion with a small cookie scoop now and press lightly right after dropping it in. More uniform shape and they brown way more evenly that way.
I’ve made at least three other keto apple fritter recipes and most of them are just almond flour dough with apple extract dumped in, which you can taste. The zucchini here actually changes the texture, you get pieces that behave like real apple chunks instead of a uniform dough ball all the way through. Four stars because I had to dial back the apple flavoring a bit (the 1/2 teaspoon was almost medicinal to me, 1/4 was the sweet spot), but the base is the best I’ve tried.
The 1/4 is where I usually land. Brand matters a lot, some extract is way more concentrated than others. That zucchini texture was exactly what the four test batches were for.
I’ve been meaning to make these for weeks. Don’t usually keep lard around, so I grabbed avocado oil, but now I’m second-guessing it. Would that work for frying, or is lard what actually gives you that crunchy crust?
Avocado oil works fine. The crunch comes from the hot oil and the dough itself, not specifically from lard. Lard adds a little richness but you won’t miss it.
Two months keto and this was my first time frying anything from scratch. The zucchini-as-apple thing seemed like a stretch, but the apple extract and cinnamon won me over. My fritters had this crackly crust and a soft, almost buttery center (didn’t see that coming). Quick question: do they hold up overnight? Wondering if the crust stays crispy.
