Sour Cream Apple Pie

2 tablespoons all-purpose flour
1/4 teaspoon salt
3/4 cup white sugar
1/4 teaspoon ground nutmeg
1 egg
1 cup dairy sour cream
1 teaspoon vanilla extract
3 cups diced, pared apples
1 unbaked 9 inch pie shell
1/3 cup white sugar
1/3 cup all-purpose flour
1 teaspoon ground cinnamon
2 tablespoons butter or margarine
                   
1. Stir together 2 tablespoons flour, salt, 3/4 cup sugar
   and nutmeg in bowl. Combine egg, sour cream and
   vanilla in another bowl; mix well. Add egg mixture to dry
   ingredients; mix well. Stir in apples and spoon mixture
   into unbaked pie shell. 
2. Bake in a preheated 400 degree F oven 15 mins. 
3. Reduce temperature to 350 degrees F and bake 30 min more.
   Remove pie from oven. Increase temp to 400 degree F. 
4. Prepare cinnamon topping and sprinkle over pie. Return
   to oven and bake 10 mins more. Cool on rack. 
5. To Make Cinnamon Topping: Combine 1/3 cup sugar, 1/3
   cup flour and 1 teaspoon ground cinnamon in bowl. Cut
   in 2 tablespoons butter or regular margarine until
   crumbly, using a pastry blender.