INGREDIENTS

 1 (9 inch) single crust pie shell ( see basic recipe above)
 3 cups blackberries
 3/4 cup white sugar
 1/3 cup all-purpose flour
 2 cups sour cream
 1/2 teaspoon vanilla extract
 2 tablespoons flour
 2 teaspoons brown sugar
 2 teaspoons butter, melted

DIRECTIONS:

1 In a bowl, combine 3/4 cup sugar and flour. Whisk in  sour cream and vanilla. Arrange raspberries evenly in the   pie shell. Spread sour cream mixture over berries.

2 Combine flour, 2 teaspoons sugar, and melted  butter or margarine, until mixture forms crumbles. Sprinkle over pie.

3 Bake at 400 degrees F (205 degrees C) for 30 to 40  minutes, or until pastry and filling are golden. Cool on rack.Serve same day at room temperature.