1 pkg. Betty Crocker wild blueberry muffin mix
1/2 c. dairy sour cream
1 egg
1/4 c. milk
Streusel (below)

Heat oven to 400 degrees. Grease square pan, 8 x 8 x 2 inch. Drain blueberries; rinse. Mix sour cream, milk, and egg. Stir in muffin mix just until moistened. Spread 1/2 batter in pan. Sprinkle with 1/2 the Streusel. Spread remaining batter over streusel, then sprinkle with blueberries, then remaining streusel. Bake until golden brown, 30-35 minutes. 9 servings.

STREUSEL:

1/2 c. brown sugar, packed
1/3 c. flour
1/2 tsp. cinnamon
1/4 c. firm butter, cut into chunks