Blueberry Pie

With an electric mixer, beat sour cream, the 2 tablespoons of flour, sugar, vanilla, salt, and egg until smooth--about 5 minutes. Remove from mixer and fold in blueberries. Pour into the pie crust and bake at 400 degrees for 25 minutes.
When time is up, combine the 3 tablespoons of flour, margarine, and pecans, mixing well. Sprinkle that over the top of the pie and return to hot oven for 10 more minutes. Let cool and then chill in refrigerator completely before serving.
Makes 8 servings.