Preheat your oven to 375°F / 190°C. Grease or line a 12-cup muffin tin.
Step 1. Whisk or sift the flour, baking powder, baking soda, salt, and cinnamon in a bowl. Set aside.
Step 2. Toss the blueberries with 1 tablespoon of flour. Set aside.
Step 3. Pulse the cottage cheese in a food processor or blender for about 30 seconds until smooth. Optional, but it adds air and means no visible curds in the finished muffin.
Step 4. Beat the softened butter in a large bowl with an electric mixer until light and fluffy, about 2 minutes. Using oil instead? Just whisk it with the egg yolks, maple syrup, and lemon zest or vanilla extract, then continue with Step 6.
Step 5. Separate the eggs. Add the yolks, maple syrup, and lemon zest or vanilla extract to the butter. Beat until fluffy and pale.
Step 6. Beat in the blended cottage cheese until light, about 1 minute. Add the milk and beat until the mixture looks airy.
Step 7. Add the dry ingredients in two additions, folding with a rubber spatula until the streaks just disappear. Stop there.
Step 8. In a clean bowl, beat the egg whites until soft peaks form.
Step 9. Add the blueberries and egg whites to the batter together. Fold with just a few strokes. A couple of white streaks are fine. Don't overdo it or you'll lose all the air you just built up.
Step 10. Divide among the muffin cups, about ¾ full. Bake at 375°F / 190°C for 5 minutes, then drop the temperature to 350°F / 175°C without opening the oven and bake another 15–18 minutes. Use a toothpick, not the color. These stay paler than traditional muffins because of the cottage cheese.
Step 11. Cool in the pan for 3 minutes, then move to a wire rack.