1. Preheat your oven to 175°C. Grease an 20×20cm baking dish and set aside.

2. In a mixing bowl, combine the almond flour, coconut flour, and powdered erythritol for the crust. Mix well.

3. Add the melted butter to the dry ingredients and mix until a crumbly dough forms.

4. Press the dough evenly into the bottom of the prepared baking dish to form the crust.

5. Bake the crust in the preheated oven for about 12-15 minutes, or until golden brown. Remove from the oven and set aside to cool.

6. In another mixing bowl, whisk together the eggs, powdered erythritol, lemon juice, lemon zest, and coconut flour until well combined.

7. Pour the filling mixture over the cooled crust and spread it out evenly.

8. Bake in the oven for about 20-25 minutes, or until the filling is set and slightly golden on top.

9. Remove from the oven and let it cool completely in the baking dish.

10. Once cooled, sprinkle the powdered erythritol over the top as a finishing touch.

11. Cut into squares or bars and serve. Store any leftovers in an airtight container in the refrigerator.

Enjoy your delicious Keto Lemon Bars!