1/2 cup Butter 1 cup Sugar 2 Eggs 1 cup Banana - ripe and mashed 1/2 tsp Vanilla 1/2 cup Sour cream 2 cups Flour 1 tsp Baking soda 1 tsp Baking powder 1/4 tsp Salt 1/2 cup Mini Chocolate chips Cream butter and sugar - Beat in eggs, banana and vanilla Fold in sour cream Combine flour, baking soda, baking powder and salt - fold into mixture just to blend Add chocolate chips Spoon into greased muffin pans Bake at 350 for 15-20 minutes