Preheat Oven
Heat oven to 375°F (190°C) and line a baking tray with parchment paper.
Mix Dry Ingredients
In a large bowl, combine oat flour, protein powder, sugar, baking powder, and salt.
Combine Wet Ingredients
In a separate bowl, whisk together espresso, Greek yogurt, egg, melted coconut oil, and vanilla extract.
Form the Dough
Gradually add the wet mixture into the dry ingredients, stirring until a dough forms.
Shape and Bake
Transfer dough to a floured surface, pat it into a round shape, and cut it into 8 wedges. Arrange on the baking tray.
Bake to Perfection
Bake for 18-20 minutes, until golden brown and firm. Cool slightly before serving.