1/3 c. soft butter
1 c. sugar
1 egg
1 tsp. vanilla
2 c. flour
2 tsp. baking powder
3/4 c. milk
1/2 c. sour cream
1 c. fresh blueberries

Preheat oven to 375 degrees. Cream first 4 ingredients. In a separate bowl, sift flour and baking powder together. Add to creamed mixture alternately with milk and sour cream. Fold in blueberries. Spoon into greased muffin tin and sprinkle with crumb mixture: 1/3 c. flour 1/3 c. brown sugar 1/2 tsp. cinnamon

Bake 20 to 25 minutes.