Keto Berry Pie

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This keto berry pie has a super fruity berry filling and a crispy fathead lattice top. Your guests will never guess this mixed berry pie is low in carbs and free of added sugars!

A berry pie with a lattice crust topping and a scoop of vanilla ice cream on top.

There’s nothing like a sugar free berry pie, no matter what the weather looks like outside! I always have frozen berries at home - blueberries, raspberries and blackberries. I like to use them in my keto granola recipe for breakfast and of course they are invaluable for blueberry coconut flour muffins!

I've been wanting to make a Keto berry pie for a while. You all know I'm a big fan of fathead dough - I love that it works in both sweet and savoury recipes, from keto cinnamon rolls to keto pot pie. I think the fathead dough works really well on top of this pie, it's lovely and crisp.

This recipe has all the taste and comfort of a good berry pie but I'm calling it my cheats skinny version because it doesn’t have a base. I was after a dessert that's satisfying yet not incredibly heavy and filling.

This pie has been a huge success with my entire family, including the picky teenagers. I hope you'll try it!

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Ingredients
Instructions
The Perfect Lattice Pie Crust
Variations
Recipe FAQs
Serve With
Storage And Reheating
More Sugar Free Berry Desserts
Recipe

Ingredients

FILLING

Berries - I used frozen blueberries, blackberries and raspberries. You can also use fresh berries.
Sweetener - Any sugar substitute works - erythritol, monk fruit, allulose or xylitol.
Flavorings - Lemon juice and zest plus cinnamon
Ground chia seeds - to thicken the filling. Ground chia is incredibly useful for thickening anything in low-carb cooking, from jams to sauces. You can even use it as a vegan replacement for eggs. I always keep a jar of ground chia in my larder.

PIE CRUST TOPPING

Mozzarella - shredded mozzarella (not the white mozzarella balls, they are too watery)
Almond flour
Egg
Sweetener

Instructions

Here is how to make a keto-friendly mixed berry pie:

Berry Filling

STEP 1

Add the frozen berries, sweetener, lemon juice, zest and cinnamon to a pan. Cook on a medium heat to reduce the liquid, stirring occasionally.

STEP 2

Stir through the ground chia and heat for another 2 minutes. Then, let the berry mixture cool to thicken. Adjust the sweetness to taste and add more chia if you like it thicker.

Pie Crust Topping

STEP 3

Melt the mozzarella in the microwave or in a non-stick pot on the stove over low heat.

STEP 4

Add the almond flour and egg and mix until you have a smooth dough. Knead if necessary.

Assembly

STEP 5

Add the berry filling to the pie dish.

rolled out fathead dough cut into strips

STEP 6

Roll the dough between two sheets of parchment paper and cool in the fridge. Then, cut into strips with a pizza cutter or sharp knife.

mixed berry pie with lattice fathead crust before baking

STEP 7

Top the keto berry pie with a lattice. Trim the dough at the edges. Brush with a little egg white and sprinkle with low-carb sweetener.

STEP 8

Bake in the preheated oven until golden on top.

The Perfect Lattice Pie Crust

First of all, make sure your dough is cool enough so it's easy to handle. You can even make the dough strips the night before and leave them in the fridge overnight.

To make the lattice top, lay the bottom strips on top of the berries. Then, starting at one side, add a strip perpendicular and just lift the bottom ones up and under.

Don’t worry about making your weave perfect with under and over too much. Rustic imperfection is good!

Katrin's Top Tips

#1 Short on time? Simply roll out the dough and cover the pie with a basic pie crust. Don't forget to cut a few holes into the crust so the steam can escape!

#2 The baking time depends on the thickness of the lattice crust. The thicker the crust is, the longer it will need to bake in the oven.

#3 I wanted the consistency of this berry pie to be more on the runny side. But you could double the amount of ground chia and end up with a filling that's firm and sliceable when cold. I tested this in my sugar free cranberry bars.

berry pie in a pie pan with a scoop of vanilla ice cream and a spoon

Variations

Feel free to vary the berries!

Use only blackberries for a sugar free blackberry pie
Make a keto blueberry pie with just blueberries
You get the picture - raspberries, cranberries and even gooseberries would be delicious! Adjust the amount of sugar substitute depending on how sweet the berries are.

Recipe FAQs

How do I make a pie with a base?

Make a second batch of pie crust. Roll out thinly between 2 sheets of parchment paper. Grease the pie dish and lay the crust into the dish. Trim the edges. Add the berry filling and top with the lattice.

Can I make a dairy-free pie crust?

I recommend that you make the crust from my keto quiche using coconut oil instead of butter.

How do I make a nut free pie crust?

Use ⅓ the amount of coconut flour in place of the almond flour. Or, use a blend of sesame seed flour and sunflower seed flour.

Serve With

My favorite way to serve sugar free berry pie is with homemade sugar free ice cream. It also tastes great with a spoonful of Greek yoghurt, sour cream, whipped cream or coconut yogurt.

Storage And Reheating

Store the pie in an airtight container in the fridge for up to 2 days. After that, the crust becomes a little soggy because of the high moisture content of the filling.

It is possible to freeze this pie for up to 3 months. Although, you will have to freeze it in the same pie dish that you baked it in.

Reheating Leftovers: I think berry pie tastes best when it is warm. Gently reheat single servings in the microwave. Or, reheat the entire pie in a hot oven (200C/400F) for 5 minutes. This will also crisp up the lattice crust.