Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   1      9"            pie crust
                        -----FILLING-----
   1 1/4  cups          Sour cream
   1      cup           Sugar
   3      tablespoons   Flour
     1/4  teaspoon      Salt
   1 1/4  teaspoons     Vanilla
   4      cups          Thin sliced tart apples
   1                    Egg -- beaten
                        -----CRUMBS-----
     1/4  cup           Cold butter
     1/3  cup           Flour
     1/3  cup           Brown sugar

Preparation:

Blend crumb ingredients together and set aside. Combine sour cream, sugar, flour, salt and vanilla. Add apples and beaten egg. Bake in shell for 25 minutes @ 400F. Remove from oven, add crumbs. Return to oven for 20 minutes. Cool and refrigerate. Serve when cold.