Blueberry Cream Pie
["1 c. commerical sour cream", "2 Tbsp. all-purpose flour", "3/4 c. sugar", "1 tsp. vanilla extract", "3/4 tsp. salt", "1 egg, beaten", "2 1/2 c. fresh blueberries", "1 unbaked 9-inch pastry shell", "3 Tbsp. all-purpose flour", "3 Tbsp. butter, softened", "3 Tbsp. chopped black walnuts"]
["Combine first 6 ingredients; beat 5 minutes at medium speed of an electric mixer or until smooth.", "Fold in blueberries.", "Pour filling into pastry shell.", "Bake at 400\u00b0 for 25 minutes."]
["commerical sour cream", "flour", "sugar", "vanilla extract", "salt", "egg", "fresh blueberries", "pastry shell", "flour", "butter", "black walnuts"]