Preheat oven to 350°F.

In large bowl, whisk together sour cream, sugar, eggs, flour, vanilla, & salt.

Add apples; stir until well coated. Spoon into pie crust.

For the crumble. Stir together oats, flour, sugar, & cinnamon.

In small microwave safe bowl, place peanut butter and butter. Microwave on high for 30sec. stir until smooth. Add to oat mixture & blend until crumbs form. Sprinkle over apples.

Bake for 55 to 60 minutes or until apples are tender and topping is golden brown.

cool completely on wire rack.