Preheat the oven to 350°F/175°C. Line an 8-inch/20-centimeter square baking pan with parchment paper, leaving an overhang to lift the brookies out.
Whisk the melted coconut oil, eggs, honey, vanilla, almond flour, cocoa powder, and salt in a large bowl until smooth. Pour the batter into the prepared pan and spread it into an even layer.
Combine the oat flour, peanut butter, egg, honey, vanilla, and baking powder in a separate bowl until a cohesive dough forms. Fold in the chocolate chips. Using two spoons, drop small, evenly spaced spoonfuls of the cookie dough over the brownie batter; do not press them in — leave a thin, patchy swirl.
Bake until the cookie topping is lightly golden and the center is just set, about 16 minutes. Cool completely in the pan on a wire rack, then lift out using the parchment overhang and cut into 16 squares.