Preheat oven to 350 degrees.
In a mixer, cream together butter and sugar until creamy.
Add in the eggs, and the bananas.
Beat until mixed well.
In another bowl mix together flour, baking soda, and salt.
Slowly add the flour mixture to the mixer.
Fold in the blueberries by hand.
Fill a paper lined muffin pan
Bake for 30 minutes or until a toothpick inserted in the center comes out clean.Gluten Free