Preheat oven to 375 degrees. ... mixture alternately with milk and sour cream. Fold in blueberries. Spoon into greased muffin tin and sprinkle with crumb topping. Bake 20-25 minutes.
Cream butter, sugar, egg and ... add dry ingredients, milk and sour cream. Fold in the blueberries. Spoon into muffin papers. Sprinkle with crumb topping.
Preheat oven to 375 degrees. ... mixture alternately with milk and sour cream. Fold in blueberries. Spoon into greased muffin tin and sprinkle with crumb ... 20 to 25 minutes.