Name: Keto Apple Pie with Zucchini Filling Recipe
Prep time: 30 min
Cook time: 45 min
Total time: 75 min
Ingredients: 2 cups superfine almond flour; 1/4 cup granulated erythritol or allulose; 1/4 tsp salt; 1/4 cup cold unsalted butter, cubed; 1 large egg, beaten; 4 cups diced zucchini, peeled and seeded; 2 tbsp unsalted butter; 1/4 cup golden monk fruit sweetener; 1 tbsp fresh lemon juice; 1 tsp ground cinnamon; 1/4 tsp ground nutmeg; 1/2 tsp vanilla extract; Pinch of salt; 1/4 tsp xanthan gum (optional); 1/2 cup almond flour; 2 tbsp melted butter; 1 tbsp sweetener; 1/4 tsp cinnamon

This keto apple pie swaps apples for tender zucchini simmered with cinnamon, lemon, and a buttery sweetener until it tastes like the classic. It bakes up with a flaky almond flour crust and a golden crumble top, all while keeping carbs low and sugar out of the picture.

The filling gets that familiar soft bite, and the warm spice blend tricks your palate in the best way. Make it for a holiday table or just because you miss a good slice of pie.

Why This Pie Works

The zucchini absorbs the cinnamon and lemon so completely that for a moment you honestly forget there is no apple in there. The crust stays crisp, and every slice holds its shape without crumbling.

It scratches that apple pie itch without knocking you out of ketosis, and you can serve it warm with a scoop of keto vanilla ice cream just like the real thing.

Ingredients

For the crust:

2 cups superfine almond flour: blanched almond flour works best, not almond meal.
1/4 cup granulated erythritol or allulose: allulose keeps the crust softer and helps with browning.
1/4 tsp salt: brings out the buttery flavor.
1/4 cup cold unsalted butter, cubed: cold butter creates flaky layers.
1 large egg, beaten: binds the dough.

For the filling:

4 cups diced zucchini (about 3 medium), peeled and seeded: use firm zucchini and remove the watery core so the filling stays firm.
2 tbsp unsalted butter: for sautéing.
1/4 cup golden monk fruit sweetener (or brown sugar substitute): the golden kind adds a deeper caramel note.
1 tbsp fresh lemon juice: brightens the filling and mimics apple tang.
1 tsp ground cinnamon: the essential spice.
1/4 tsp ground nutmeg: just a pinch for warmth.
1/2 tsp vanilla extract: rounds out the sweetness.
Pinch of salt: pulls everything together.
1/4 tsp xanthan gum (optional): thickens the juices so the filling sets up like a traditional apple pie.

Variations / Substitutions

Sweetener swap: any granulated keto sweetener works; allulose yields a softer filling.
Skip the xanthan gum: the pie will still taste great, just have a thinner, more cobbler-like filling. You can stir in 1 teaspoon of coconut flour instead to absorb extra liquid.
Dairy free: swap the butter for solid coconut oil or a keto-friendly vegan butter stick.
Nut free crust: use a store-bought nut-free keto crust or try the crust from my Keto Pumpkin Pie recipe.

How to Make Keto Apple Pie with Zucchini Filling

Step 1: Make the Crust Dough

Preheat your oven to 350°F (175°C). In a large bowl, whisk together the 2 cups almond flour, 1/4 cup sweetener, and 1/4 teaspoon salt. Add the cold cubed butter and work it in with a pastry cutter or your fingertips until the mixture looks like coarse crumbs. Stir in the beaten egg until a dough forms.

The dough should hold together when pressed but not be sticky. If it crumbles, add a teaspoon of cold water at a time. Shape it into a disc, wrap in plastic, and chill while you prepare the filling.

Step 2: Par-Bake the Crust

Roll the chilled dough between two sheets of parchment paper into a circle about 11 inches wide. Peel off the top paper and flip the dough into a 9‑inch pie dish. Press it gently into the corners, trim any overhang, then crimp the edges. Poke the bottom all over with a fork, line with parchment or foil, and fill with pie weights or dried beans.

Bake for 10 minutes, then remove the weights and parchment and bake another 5 minutes until the bottom looks dry and set. It will not be fully browned yet. Let it cool slightly on a wire rack.

Step 3: Sauté the Zucchini Filling

Melt the 2 tablespoons butter in a large skillet over medium heat. Add the 4 cups diced zucchini and cook, stirring occasionally, for about 8 to 10 minutes until the zucchini is translucent and has released most of its liquid. You want it soft but not mushy.

Stir in the 1/4 cup sweetener, lemon juice, cinnamon, nutmeg, vanilla, and pinch of salt. If using xanthan gum, sprinkle it over and stir thoroughly. Cook for another 2 minutes until the mixture thickens slightly and smells fragrant. Remove from heat and let it cool to room temperature before filling the pie.

Step 4: Assemble the Pie

Spoon the cooled filling into the par-baked crust and spread it evenly. In a small bowl, combine 1/2 cup almond flour, 2 tablespoons melted butter, 1 tablespoon sweetener, and 1/4 teaspoon cinnamon. Sprinkle this crumble evenly over the top.

The crumble will brown and become crisp in the oven, giving you a streusel-like topping without needing a full top crust. No need to be precise – just cover the filling so every bite gets some crunch.

Step 5: Bake and Slice the Pie

Bake at 350°F (175°C) for 25 to 30 minutes, until the crumble is golden and the filling is bubbling around the edges. If the crust edges brown too quickly, tent them with foil after 15 minutes.

Let the pie cool for at least 30 minutes before slicing. This resting time allows the filling to set so you get clean, neat slices. Slice while still warm and serve with a scoop of keto vanilla ice cream. Cut into it and the filling looks glossy and cinnamon-flecked, just like a real apple pie.

Tips for the Best Keto Apple Pie

Blot the cooked zucchini: with paper towels after sautéing if it still seems wet. Even a little extra moisture can make the crust soggy.
Chill the fully assembled pie for 10 minutes: before baking if your kitchen is warm. This helps the crust hold its shape.
Use a pie shield or foil ring from the start: of baking. Almond flour crusts brown faster than white flour ones.
Add 1/2 teaspoon of apple extract: to the filling if you want a stronger apple flavor without sugar.

Bake times by pan:

Pan size	Material	Bake time
9‑inch	glass or ceramic	25–30 minutes
8‑inch	glass or ceramic	30–35 minutes
9‑inch	dark metal	check at 22 minutes

Storing Leftovers

Refrigerate: store the pie wrapped tightly or in an airtight container in the fridge for up to 5 days.
Reheating: warm slices in a 300°F oven for 10 minutes or microwave for 20 seconds.
Serve Cold: the pie also tastes great straight from the fridge, especially for breakfast with coffee.

What to Serve with Keto Apple Pie

A scoop of keto vanilla ice cream melts into the warm pie and mimics the classic a la mode experience. Sugar‑free caramel sauce adds another layer of richness, and a strong cup of black coffee cuts through the sweetness nicely.

Frequently Asked Questions

Can I use a different vegetable instead of zucchini?

Yes, chayote squash works beautifully. Peel and seed it the same way, and the texture will be almost indistinguishable from apple.

Is this pie gluten free?

Yes, the almond flour crust contains no wheat or gluten. Just check any store‑bought sweetener or xanthan gum for gluten‑free certification.

Can I make the crust dairy free?

Absolutely. Replace the butter with an equal amount of solid coconut oil or a keto vegan butter stick. Keep it cold for the flakiest results.

How do I know when the pie is done baking?

The crumble should be deep golden and the filling should bubble thickly around the edges. If you want to be precise, an instant‑read thermometer inserted in the center should read around 200°F (93°C).

Can I freeze leftover keto apple pie?

Yes. Wrap individual slices tightly in foil and place them in a freezer bag for up to 3 months. Thaw in the refrigerator overnight and reheat before serving.