1¼ cups fresh or unthawed frozen blueberries, divided
Method
Preheat oven to 350 degrees F. Lightly grease a 12 cup muffin pan.
In a large bowl, mix the flour, brown sugar, cinnamon, baking powder, and baking soda. In a separate bowl, mix the bananas, egg whites, milk and vanilla extract.
Mix the banana mixture into the flour mixture until just combined - do not overmix. Carefully fold in 1 cup of the blueberries. Spoon the batter into the prepared muffin pan and dot with remaining ¼ cup berries.
Bake 16 to 18 minutes at 350, or until a toothpick inserted in the center of a muffin comes out clean.