1 qt. blueberries
1 c. sugar
1 1/2 tbsp. butter
1 c. water
3 tbsp. flour, generous
1 tsp. vanilla
1 frozen pie crust
1 pkg. Dream Whip

Heat sugar, flour, and water, stirring until thick. Add butter and let it melt. Add a few crushed blueberries for color. Cool and add vanilla. Pour over berries. Mix gently. Pour into pie shell. Prepare package of Dream Whip according to package directions. Add to top of pie and chill.