Easy Banana Bread Muffins

Ingredients
1/3 cup melted butter
4 ripe bananas
1/2 cup sugar
1 egg
1 teaspoon vanilla
1 teaspoon baking soda
pinch of salt
1 1/2 cups whole wheat flour

Preheat over to 350 F. In a large bowl, melt butter, mix in mashed bananas.  Mix in sugar, egg and vanilla. Mix well with little to no lumps.  Sprinkle the baking soda and salt over mixture and mix in.  Add flour last and mix. Spray muffin pan with cooking oil and spoon mixture equally into muffin pan, making 12 muffins.  Place in preheated oven for 20 minutes and muffins are done when toothpick inserted comes out clean.  Cool on rack if possible.