Optional: Blend cottage cheese smooth in a blender for 30 seconds.
Preheat oven to 425°F (220°C). Line a 12-cup muffin tin with liners.
Whisk cottage cheese, eggs, oil, milk, sugar, vanilla, and lemon zest together in a large bowl until smooth.
In a separate bowl, whisk flour, baking powder, baking soda, and salt.
Toss blueberries in 1 tablespoon flour until lightly coated.
Add dry ingredients to wet and fold with a spatula until just combined — stop the moment no dry flour is visible. Do not overmix.
Fold in blueberries gently in 2 to 3 folds.
Divide batter between the 12 cups, filling each to the very top. Sprinkle with lemon sugar topping if using.
Bake at 425°F for 5 minutes. Without opening the oven, reduce to 375°F (190°C) and bake for a further 15 to 17 minutes until golden-domed and a toothpick comes out clean.
Cool in the tin for 5 minutes then transfer to a wire rack.