Preheat oven to 375 degrees F. Prepare 12 cup muffin tin with paper cups(optional, i didnt use them)
Mash bananas in a large bowl. Add additional ingredients (except blueberries) slowly while mixing. You can use stand mixer to speed up the process. Fold in blueberries.
Pour even amount of batter using cookie spoon into each muffin cup. Bake for about 15-20 minutes.