Banana Blueberry Muffins

2 ripe bananas
2 eggs
1c. brown sugar
1/2c. melted butter
1 tsp. vanilla
2 1/4c. whole wheat flour
2 tsp. baking powder
1 tsp. cinnamon(opt.)
1 tsp. salt

Mix the 1st 5 ingredients together.
Add all the rest.
Fold in blueberries gently.
Pour into muffin pans.
Bake 350 for 12-15 mins.