The key to both a flaky piecrust and crisp streusel topping is to keep the pie crust and the butter as cold as possible before putting the pie together. Preheat oven to 450 degrees F. Follow ...

The use of sour cream in apple pies is ... Prepare pie: Stir together sugar and flour in a large bowl. Stir in sour cream, egg, vanilla, and salt, then apples. Pour into crust and bake for 40 minutes ...

For a full list of ingredients, check out the recipe card below. Here is how to make sourdough apple pie with oat streusel ...