Preheat oven to 350 degrees F. or 180 C.
I use parchment paper, overlapping pan and spray with baking spray for an 8 x 8 brownie pan.
Mix dry ingredients: almond flour, coconut flour: baking powder, baking soda, salt, xanthan gum. Set aside.
Beat eggs in mixer.
Stream oil in while mixer is running. This emulsifies the oil to the eggs.
Add Swerve or erythritol of choice.
In separate bowl mix cocoa powder, with boiling water. It may be thick and that's okay. The boiling water blooms the powders for extra flavor.
Add in sour cream to cocoa mixture, as cocoa mixture will be quite thick.
Add this cocoa mixture to egg mixture.
Add in dry mixture, and mix just until mixed. Do not over-mix.
Add in chocolate chips.