Preheat & Prep: Set oven to 350°F (175°C). Line a baking sheet with parchment paper or a silicone mat.
Mix Wet Ingredients: In a large bowl, whisk together Greek yogurt, sweetener, egg, and vanilla until smooth. (And yes, licking the whisk is mandatory
Combine Dry Ingredients: In a separate bowl, mix oat flour, protein powder, baking soda, and salt.
Bring It Together: Gently fold dry mixture into the wet. Don’t overmix—just until no flour streaks remain. Stir in your chosen mix-ins.
Shape the Cookies: Scoop out tablespoon-sized portions, place them on the baking sheet, and flatten slightly.
Bake: Bake 10–12 minutes, until edges are golden. Let cool on the sheet for 5 minutes, then transfer to a wire rack.