Preheat your oven to 375°F (190°C). use a silicone muffin tin if possible or line a 12-cup muffin tin with muffin liners or lightly grease with cooking spray.
Prepare the dry ingredients: In a small bowl, whisk or sift together the flour, baking powder, baking soda, salt, and cinnamon if using. This is to avoid those nasty clumps and make sure your raising agents are distributed evenly.
Wash and dry blueberries. Toss them with 1 tablespoon of flour to prevent bleeding and to stop them from settling to the bottom of the muffin.
(Optional step) Process the cottage cheese: In a food processor or blender, pulse the cottage cheese until smooth and creamy, about 30 seconds. This will help incorporate air and ensure even distribution in the batter. The muffins will still be delicious if you don't blend the cottage cheese. You may see little pieces of cottage cheese, but you will not taste it. The flavor blends right in, but the muffin will be a tiny bit more dense.
Prepare the wet ingredients: In a large bowl, beat the butter with an electric mixer until light and fluffy, about 2 minutes. (If using oil instead of butter, then just mix the maple syrup or honey, oil and eggs together until well combined).
Separate the egg whites and yolks.
Add the egg yolks, maple syrup, lemon zest and vanilla to the butter mixture and beat until well incorporated and fluffy.
Add cottage cheese and milk: Beat in the processed cottage cheese until light and fluffy, about 1 minute. Then add the milk and beat until well combined.
Combine wet ingredients and dry ingredients: Add the flour mixture to the wet ingredients in two additions, folding gently with a rubber spatula just until no dry streaks remain. Do not overmix.
Beat the whites until soft peaks form.
Very gently fold the blueberries and the egg whites into the batter using just a few strokes to maintain the air in the muffin batter.
Fill muffin cups: Using an ice cream scoop or large spoon, divide the batter evenly among the 12 muffin cups (they should be about ¾ full).
Bake: Place in the preheated oven and bake for 5 minutes at 375°F (190°C), then without opening the oven door, reduce the temperature to 350°F (175°C) and bake for another 15-18 minutes until the tops are lightly golden and a toothpick inserted into the center of a muffin comes out clean 9see note below).
Cool: Allow the muffins to cool in the muffin pan for just 3 minutes, then carefully transfer to a wire rack to cool. This prevents the bottoms from becoming soggy.