Prepare a single pie crust. Crimp edges and set aside.
Peel apples and cut into wedges. Stir in sugar, sour cream and cinnamon. If apples are too tart, add more sugar. Put into pie crust. Top with second crust or crumb topping.
Topping: Mix together in a small bowl until it makes small crumbs. Sprinkle the topping on top of the apples evenly.
Bake at 425°F. for 10 minutes, then turn down oven to 375°F. for 45 - 50 minutes.
Recipe by Recipes Food and Cooking at https://recipesfoodandcooking.com/2007/11/20/moms-apple-pie/