Mix GF flour, GF oats, baking powder, baking soda, salt and cinnamon
Add eggs, sour cream, milk and vanilla. Mix until combined.
Gently fold in blueberries
Spray a muffin tin with non-stick spray, or line with paper liners
Fill muffin cups about 3/4 full
Bake at 350 degrees for 20-22 minutes, until lightly golden and set in the middle.
Let cool on cooling rack, or enjoy warm from the oven.