Sift flour, sugar, salt and nutmeg into large bowl. Stir in beaten egg, sour cream and vanilla. Fold in apples, spoon into unbaked pastry shell. Bake at 400 degrees for 15 minutes. Lower heat to 350 degrees. Bake 30 minutes longer.
Prepare crumb topping. Remove pie from oven. Reset oven to 400 degrees, sprinkle pie with topping. Return pie to oven. Bake 10 minutes, longer or until topping is nicely brown.
Mix ½ cup sugar, 1/3 cup flour, 1 teaspoon ground cinnamon and ¼ cup melted butter in small bowl until crumbly.
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