Preheat oven to 350.
Beat butter and sugars in large bowl until creamy.
Beat in pumkin, egg and vanilla until light and fluffy.
Mix in flour, cinnamon, baking powder, baking soda, salt and nutmeg until blended.
Lightly grease mini muffin tins and fill 3/4 full.
Bake 17-20 minutes or until set.
Cool 5 minutes in muffin tins and remove to wire racks. Cool completely.