Add the cocoa powder through baking soda to a food processor bowl, and process until the chocolate chips are broken down but still chunky.
Add the rest of the ingredients, except walnuts, to the food processor, along with the dry ingredients.
Pulse to combine all ingredients until a very thick, sticky batter is formed. When it's combined, it will form a ball. This is because the almond butter "seizes" with the liquid ingredients.
Stir in walnuts if adding.
Line a baking tray with parchment, and press the stick dough into the pan in an even layer. This is easiest with wet hands. Smooth the top.
Bake in the Sharp Superheated Steam Countertop Oven on Bake/Reheat at 350º for 12 minutes.
If using a conventional oven, preheat to 350º, and bake brownies for 17-20 minutes.
Allow brownies to fully cool before slicing.
Video
Notes
* Nutrition facts are for brownies cut into very large pieces. I typically cut desserts this rich into 12-16 pieces.