overripe bananas, mashed
Line muffin tin with paper liners.
Stir in flour, baking powder, baking soda, nutmeg and salt together in a large bowl.
In a seperate bowl, beat butter and sugar together until creamy.
Beat in eggs, bananas, sour cream and vanilla and stir to mix well.
Add flour mixture to the butter-sugar mixture and stir until flour is moist.
Spoon batter into a muffin tin to just below top of liner.
Bake muffins 20-25 minutes or until a toothpick comes out clean.