Preheat oven to 375°F (190°C) and line a muffin tin with liners. Lightly spray liners with nonstick spray.
In a large bowl, whisk together melted coconut oil, sugar, eggs, vanilla, and milk. Stir in cottage cheese until combined.
Sift in flour, baking soda, baking powder, salt, and cinnamon. Gently mix until just combined—do not overmix.
Toss blueberries in 1 tablespoon of flour to prevent sinking, then gently fold them into the batter.
Divide the batter evenly into muffin cups, filling each about ¾ full. Press a few extra blueberries on top for a bakery-style look.
Bake for 18-20 minutes, or until a toothpick inserted in the center comes out clean.
Allow to cool for 5 minutes in the tin, then transfer to a wire rack to cool completely.