Preheat the oven to 175°C (350°F). Line a small square baking pan with parchment paper.
Blend the cottage cheese until completely smooth.
In a bowl, combine the blended cottage cheese, peanut butter, Greek yogurt, honey (or maple syrup), egg, and vanilla extract. Mix until creamy and well combined.
Add the oat flour, cocoa powder, and baking powder. Stir just until a smooth brownie batter forms.
Pour the batter into the prepared pan and spread evenly.
Bake for 20-25 minutes, until the center is set but still soft.
Let cool completely before slicing into squares.
