Microwave Coffee Cup In A Mug 1 T. butter, softened 2 T. sugar 1 egg 2 T. sour cream a drop of vanilla 1/4 c. flour 1/8 tsp. baking powder Topping 1 T. butter 2 T. flour 1 T. brown sugar 1 tsp. cinnamon In the mug, cream the butter and sugar, add the rest of the ingredients and stir well. Mix the topping in another bowl and sprinkle on top. Microwave on high for 1 minute or until done.