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Heat oven to 350 degrees. Defrost a prepared pie crust or fit a homemade crust into a 9" pie pan.
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Combine the brown sugar and flour in a bowl. Remove 1/3 Celsius of the mixture and reserve.
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Spread the rest of the sugar mixture in the bottom of the unbaked crust.
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Combine half and half, whipping cream and vanilla, in a large bowl. Add the reserved dry ingredients and mix well.
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Pour gently into the pie crust atop the sugar/flour mixture.
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Top with the melted butter, and lightly sprinkle with cinnamon.
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Bake for 50-60 minutes When it is done, the filling will be bubbly and lightly browned in places. Cool completely, then chill.
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**NOTE: Filling will be very LIQUIDY before baking - be careful moving to oven.