In a mixing bowl, whisk together egg whites, coconut oil, honey, peanut butter, and vanilla until smooth. Add oats, oat flour, protein powder, cocoa powder, baking powder, and salt. Stir until a cohesive batter forms. Refrigerate for at least 15 minutes until batter thickens (this is important!).

Preheat oven to 350℉. Line a large baking sheet with parchment paper.

Use a ~1.5 tbsp cookie dough scoop to portion dough onto prepared baking sheet. Top with a few additional chocolate chips and slightly press each cookie dough mound down with the palm of your hand. Bake cookies for 12-14 minutes until set.

Let cookies cool on baking sheet for 5 minutes before transferring to a wire cooling rack.