Preheat oven to 350°F (175°C). Line an 8x8-inch pan with parchment. Whisk almond flour, protein powder, cocoa, baking soda, and salt together in a large bowl.

In another bowl, whisk eggs, yogurt, maple syrup, milk, and vanilla until smooth.

Fold the wet mixture into the dry until just combined, then fold in the chocolate chips.

Spread batter into the prepared pan, top with extra chips, and bake 18 to 22 minutes until edges are set and a toothpick has moist crumbs.

Cool in the pan for 20 minutes, then lift out, slice into 9 squares, and serve.