Prepare 9x13 pan by greasing with cooking spray or butter.
In a small bowl mix together almond flour and powdered sweetener. Add melted butter and combine with your hands to mix together until it forms into a dough. Push dough into bottom of greased 9x13 pan.
Bake for 15-17 minutes.
Mix eggs, erythritol, lemon zest, lemon juice, baking powder and coconut flour in a blender. Blend for 10 seconds, scrape the sides and blend for 5 more seconds. Pour filling mixture into baked crust.
Bake for 20-25 minutes, or until filling has a crust and bounces back in the center when touched. Sprinkle additional low carb powdered sweetener over bars at this time. Allow lemon bars to cool 10-15 minutes before slicing.
Please not that there are 36 grams of sugar alcohol in the entire recipe and should be accounted for if you calculate the net carbs. We explain this a little more in detail in the above post.