Topping:

1/4 c. sugar
1/3 c. flour
1/2 tsp. cinnamon
1 tbsp. butter, melted
1/4 c. shortening
1 c. sugar
1 egg
2 c. flour
1 tsp. baking powder
1/2 tsp. salt
3/4 c. milk
1 tsp. vanilla

Cream together first 3 ingredients. Add remaining ingredients. Blend well and fold in 3 cups blueberries. Spread in greased 9 x 13 pan and sprinkle topping over all.

Bake at 350°F for 35 minutes.