In a microwave-safe mug, whisk together the blended cottage cheese, ricotta, and egg until smooth.
Stir in the oat flour (or almond flour), maple syrup or honey, lemon zest, and baking powder. Mix until fully combined and lump-free.
Microwave on high for 60–90 seconds, or until the cake is set in the center.
Let it cool for 1–2 minutes. Top with extra lemon zest or a light dusting of powdered sugar if desired.
