01 -
Preheat oven to 350°F (175°C).
02 -
Line muffin tins with liners or spray with non-stick cooking spray.
03 -
Mash the bananas with a fork or in a food processor until smooth.
04 -
In a large mixing bowl, combine flour, oats, sugar, baking powder, baking soda, and salt using a fork or whisk.
05 -
In a separate bowl, slightly beat the egg. Then add milk, oil, and vanilla, stirring to combine.
06 -
Stir the mashed bananas into the wet ingredients until well combined.
07 -
Pour the wet ingredients into the bowl with the dry ingredients. Mix well until combined. Gently fold in the blueberries.
08 -
Fill the muffin tins two-thirds full with the batter.
09 -
Bake for 20-25 minutes or until a toothpick inserted into the center of a muffin comes out clean.