Banana Blueberry Muffins

5 bananas (mashed)
1/3 cup oil
2 eggs
3 teaspoons vanilla
2 teaspoon salt
2 teaspoon baking powder
2 teaspoons baking soda
1/3 cup sugar (or less, or none)
2 cups flour
2 cups blueberries

Mix together wet ingredients. Sift together dry ingredients and add to wet mixture. Add blueberries and mix well. Bake for about 30 minutes at 350 degrees Fahrenheit until brown.