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Preheat your oven to 450°.
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Prepare your crumb topping by cutting the butter into the cinnamon, sugar, and flour mixture until it looks like coarse sand.
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Role out your pie crust to fit a 8-9 inch pie plate.
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Open your jar of pie filling, and pour it into your crust.
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Top with the crumb mixture.
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Bake at 450° for 15 minutes, the lower the temperature to 350°, and continue to bake for another 45 minutes.
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Remove your pie from the oven and allow to cool before serving.