Preheat oven to 350 degrees F.
Grease a 12 cup muffin pan with spray or line with 10 muffin liners.
Combine the oats and milk and set it aside to absorb.
Combine the flour, cinnamon, baking powder, baking soda, and salt.
In a separate bowl, whisk together sugar, oil, eggs, and vanilla.
Add in the wet ingredients to the dry ingredients. Add in the soaked oats and combine.
Rinse and pat dry the blueberries and gently mix them into the batter.
Scoop the batter into the muffin cups, about 3/4 of the way full, and bake for about 20-25 minutes or until a toothpick comes out of the muffin clean.