Prepare your bottom pie crust using a portion of flaky all-butter pie dough and line a 9 or 10-inch pie plate.
Gather and prepare your filling ingredients: Granny Smith apples, light brown sugar, cinnamon, cornstarch, apple cider vinegar, kosher salt, unsalted butter, and vanilla extract.
To make the crumble topping, place the cold, cubed unsalted butter into a bowl.
Add the all-purpose flour, rolled oats, light brown sugar, kosher salt, and cinnamon to the bowl with the butter.
Use your hands to work the ingredients together until large, cohesive clumps form.
Cook it hands-free.
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