Simple Keto Apple Pie

If you ask me, keto apple pie is one of those recipes that sounds impossible but totally works.

This low-carb dessert gives you all the cozy flavors of classic apple pie without the sugar crash. Tender spiced apples (yes, you can have apples on keto in moderation) sit in a buttery almond flour crust that’s surprisingly easy to work with.

The filling uses a sugar substitute that bakes up just like the real thing, and a bit of xanthan gum helps create that thick, syrupy texture we all love. A sprinkle of cinnamon on top brings the whole thing together.

It’s a dessert that’ll satisfy your pie cravings while keeping you on track with your goals.

What Kind of Chayote Squash Should I Use?

When shopping for chayote squash for your keto apple pie, look for ones that are firm to the touch with smooth, unblemished skin. You’ll want to pick chayote that’s light to medium green in color and feels heavy for its size, which means it’s fresh and has plenty of moisture. Avoid any squash that feels soft or has dark spots, as these are signs it’s past its prime. The cool thing about chayote is that it has a mild flavor and firm texture that mimics apples really well when cooked, making it perfect for a low-carb pie filling. You’ll need to peel and remove the seed before chopping it up for this recipe.

Options for Substitutions

This keto apple pie has some room for swaps, though a few ingredients are pretty important to keep:

• Chayote squash: This is the star of the show that mimics apples, so I wouldn’t substitute it. Zucchini is sometimes suggested, but it’s much waterier and won’t give you that apple-like texture. Stick with chayote for best results.
• Granulated sweetener: Any granulated keto sweetener works here – monk fruit, allulose, or a stevia blend. Just keep in mind that different sweeteners have different sweetness levels, so you might need to adjust the amount.
• Coconut flour: You can use almond flour instead, but you’ll need about 4-5 tablespoons since almond flour doesn’t absorb as much liquid. Add it gradually until you get the right consistency.
• Apple extract: This really helps sell the apple flavor, but if you don’t have it, try using vanilla extract plus a tiny pinch of nutmeg. It won’t be quite the same, but it’ll still taste good.
• Coconut oil: Butter works just fine as a substitute in the topping. Use the same amount and make sure it’s softened but not melted.
• Sugar free brown sugar: Regular erythritol mixed with a bit of molasses extract works, or just use more of your granulated sweetener if that’s all you have.

Watch Out for These Mistakes While Baking

The biggest mistake with keto apple pie is not properly preparing the chayote squash, which can release too much water and make your filling runny – be sure to cook the chopped chayote first until tender, then drain any excess liquid before mixing with the other filling ingredients.

Another common error is skipping the apple extract, which might seem optional but actually provides that authentic apple pie flavor since chayote is naturally mild and needs that boost.

To avoid a soggy bottom crust, pre-bake your keto pie crust for about 10 minutes before adding the filling, and make sure your coconut oil for the crumb topping has cooled to room temperature so it doesn’t melt the other ingredients.

Finally, let the pie cool completely for at least 2 hours before slicing – keto pies need extra time to set since they don’t have the same starches as traditional pies to help them firm up.

What to Serve With Keto Apple Pie?

This keto apple pie is perfect on its own, but a dollop of fresh whipped cream (made with heavy cream and a touch of vanilla) takes it to the next level. If you want something a bit richer, try serving it with a scoop of sugar-free vanilla ice cream that melts into the warm pie filling. A hot cup of coffee or unsweetened tea makes a great pairing too, especially if you’re enjoying this as an afternoon treat. For special occasions, I like to drizzle some sugar-free caramel sauce over the top or add a sprinkle of extra cinnamon for that cozy bakery feel.

Storage Instructions

Store: Keep your keto apple pie covered with foil or plastic wrap in the refrigerator for up to 5 days. The filling might release a bit of liquid as it sits, but that’s totally normal with chayote squash. I actually think it tastes even better the next day once all the flavors have had time to meld together!

Freeze: This pie freezes really well for up to 3 months. Wrap it tightly in plastic wrap, then again in foil to prevent freezer burn. You can freeze the whole pie or cut it into slices first for easier portioning later.

Serve: Let the pie thaw in the fridge overnight if frozen, then bring it to room temperature for about 30 minutes before serving. If you want it warm, pop individual slices in the oven at 300°F for about 10 minutes, or microwave for 30-45 seconds. It’s delicious on its own or with a dollop of whipped cream!

Preparation Time	15-20 minutes
Cooking Time	35-40 minutes
Total Time	50-60 minutes
Level of Difficulty	Medium

Estimated Nutrition

Estimated nutrition for the whole recipe (without optional ingredients):

• Calories: 2200-2400
• Protein: 36-44 g
• Fat: 180-200 g
• Carbohydrates: 94-110 g

Ingredients

For the crust:

• 1 9-inch keto pie shell

For the filling:

• 1 cup erythritol sweetener
• 1 tsp apple extract (optional, adds authentic apple pie flavor)
• 2 tbsp melted butter (I use Kerrygold unsalted butter)
• 4 large chayote squash (about 2 lb, chopped into 1/2-inch pieces)
• 1 tbsp lemon juice (freshly squeezed preferred)
• 1 tsp ground cinnamon (for best flavor and aroma)
• 1 1/2 tbsp coconut flour (sifted to remove lumps)

For the crumble topping:

• 1/4 cup erythritol brown sweetener (optional but recommended for deeper flavor)
• 1/2 cup finely chopped almonds (about 1/4-inch pieces)
• 1/2 cup coconut oil (melted and cooled to room temperature)
• 1/2 cup unsweetened shredded coconut (for texture and richness)
• 1 cup almond flour (I prefer King Arthur brand)

Step 1: Prepare Your Mise en Place and Preheat

• 4 large chayote squash, chopped into 1/2-inch pieces
• 1/2 cup finely chopped almonds
• 1 1/2 tbsp coconut flour, sifted
• 1 tbsp lemon juice, freshly squeezed

Preheat your oven to 180°C (350°F) and position a rack in the center.

While the oven heats, chop the chayote squash into uniform 1/2-inch pieces—this size ensures even cooking and mimics the texture of traditional apple pie filling.

Finely chop the almonds to about 1/4-inch pieces and sift the coconut flour to remove any lumps, which helps it distribute evenly without creating clumps in your filling.

Squeeze fresh lemon juice and measure out all remaining ingredients.

Having everything prepped before you start mixing ensures a smooth workflow.

Step 2: Create the Filling Base

• 4 large chayote squash, chopped into 1/2-inch pieces
• 2 tbsp melted butter
• 1 tbsp lemon juice
• 1 cup erythritol sweetener
• 1 1/2 tbsp coconut flour, sifted
• 1 tsp ground cinnamon
• 1 tsp apple extract

In a large mixing bowl, combine the chopped chayote squash with the melted butter, lemon juice, erythritol sweetener, sifted coconut flour, ground cinnamon, and apple extract (if using).

Toss everything together until the squash is evenly coated with the spice mixture.

The cinnamon and apple extract work together to create that authentic apple pie flavor, while the lemon juice adds brightness and helps break down the squash slightly as it bakes.

I like to taste the filling mixture at this point—you can adjust the cinnamon or sweetness to your preference before it goes in the pie shell.

Step 3: Prepare the Almond Crumble Topping

• 1 cup almond flour
• 1/2 cup finely chopped almonds
• 1/2 cup unsweetened shredded coconut
• 1/4 cup erythritol brown sweetener
• 1/2 cup coconut oil, melted and cooled to room temperature

In a separate bowl, combine the almond flour, finely chopped almonds, unsweetened shredded coconut, brown erythritol sweetener (if using), and melted coconut oil that has cooled to room temperature.

Mix until the texture resembles coarse breadcrumbs or wet sand.

The combination of almond flour and chopped almonds creates texture variety, while the coconut adds richness and helps the topping brown beautifully.

Don’t overmix or the topping will become dense—you want it to stay loose so it bakes up crumbly and golden.

Step 4: Assemble and Bake the Pie Base

• 1 9-inch keto pie shell
• filling mixture from Step 2

Pour the filling mixture from Step 2 into your prepared 9-inch keto pie shell, spreading it evenly with a spatula.

Place the pie in the preheated oven and bake for 20 minutes.

This initial bake partially cooks the squash and allows it to release some moisture, which helps develop the pie’s texture and allows the flavors to meld together.

The filling won’t be fully cooked at this point—that’s by design, as it will finish cooking in the final bake.

Step 5: Add the Crumble Topping and Final Bake

• pie with partial filling from Step 4
• crumble topping mixture from Step 3

Remove the partially baked pie from the oven and carefully spread the almond crumble topping from Step 3 evenly over the filling.

Return the pie to the oven and bake for 15-20 minutes, watching carefully in the final few minutes, until the crumble topping turns golden brown.

I like to check around the 15-minute mark to see how the browning is progressing—ovens vary, so start checking early rather than risk overdrying the topping.

The filling should be bubbling slightly at the edges, indicating it’s fully cooked through.

Step 6: Cool and Set

Remove the pie from the oven and let it cool for at least 5 minutes before slicing.

This resting period allows the filling to set slightly and makes cutting cleaner pieces much easier.

For best results, you can let it cool to room temperature or even chill it for a couple of hours—the pie actually tastes better when it’s completely cooled, and the filling becomes more cohesive.

Serve slices warm or at room temperature, and store any leftovers covered in the refrigerator.