Prepare Your Workspace (2 min): Preheat oven to 350°F. Line an 8x8 inch pan with parchment paper, leaving overhang for easy removal.
Create Cookie Layer (5 min): Whisk almond flour, sweetener, baking soda, and salt. Add softened butter, egg, and vanilla; mix until soft dough forms. Fold in chocolate chips gently.
Build Brownie Layer (5 min): In a separate bowl, mix almond flour, sweetener, cocoa powder, baking powder, and salt. Add softened butter and egg; beat until smooth and glossy. Batter should be thick but spreadable.
Layering (3 min): Press two-thirds of cookie dough evenly into pan. Spread brownie batter over cookie layer, leaving a ½-inch border. Drop remaining cookie dough in spoonfuls on top.
Bake (22 min): Bake 20-22 minutes until edges are set, center jiggles slightly. Top should be golden brown with visible brownie patches.
Cool & Cut (30 min): Cool completely in pan, lift using parchment overhang, cut into 16 squares with a sharp knife, wiping blade between cuts.