Sour Cream Apple Pie
["1 unbaked 9-inch pie crust", "1 egg", "1 c. sugar", "1 c. sour cream", "1 Tbsp. flour", "1/4 tsp. salt", "1/2 tsp. vanilla", "1 lb. sliced apples", "1/2 c. brown sugar", "1/3 c. flour", "1/4 c. margarine"]
["Prepare pie crust; refrigerate until ready to use.", "Heat oven to 400\u00b0.", "Beat egg slightly.", "Add sugar, sour cream, flour, salt and vanilla.", "Add apples; mix until blended.", "Put into crust. Bake for 30 minutes, or until apples are tender.", "Mix other ingredients; sprinkle over pie.", "Reduce heat to 350\u00b0 and bake for 15 minutes."]
["crust", "egg", "sugar", "sour cream", "flour", "salt", "vanilla", "apples", "brown sugar", "flour", "margarine"]