Preheat your the oven to 350°F and line a baking pan (I used an 8×8 one) with parchment paper.
Make the filling – Add the lemon juice, lemon zest, melted butter, and sweetener to a large bowl. Mix well. Then, whisk in the 6 eggs and coconut flour and set aside.
Make the crust –Add the almond flour, powdered sweetener, melted butter, egg, and salt to a large bowl. Whisk and mix well.
Press the crust dough into the pan you prepared. Bake for about 15 minutes until lightly golden brown.
Once you take the crust out of the oven, quickly give the filling a quick mix. Then, immediately pour it over the crust – don’t wait for it to cool.
Bake for about 20 minutes. Once done, remove from the oven and let it cool for 2 hours. Cut into bars and serve.