Preheat the oven to 350°F (175°C) and line a 12-cup muffin tin.
Blend the cottage cheese, eggs, mashed banana, maple syrup and vanilla until smooth.
Pulse the oats separately to a coarse flour, then fold into the wet mixture along with the baking powder and cinnamon.
Fold in the blueberries last, gently, to avoid streaking the batter purple.
Divide evenly among the 12 cups, filling each about ¾ full.
Bake 22 to 25 minutes, until a toothpick comes out clean and the tops spring back when pressed.
Cool in the tin 5 minutes, then transfer to a rack.