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Preheat oven to 350 degrees.
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Roll out your pie dough and place in a 9" pie plate (I used a 9" deep dish plate). Set aside.
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In a large bowl, combine sliced apples, granulated sugar, cinnamon, ginger, and flour. Set aside.
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In a separate bowl, mix together melted butter, maple syrup, granulated sugar, dark brown sugar, egg, milk, vanilla extract, coconut, oats, and flour.
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Add your apple pie filling first, then pour the maple oatmeal filling over the top.
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Bake for 65-75 minutes, until the filling is slightly golden brown and set (jiggles just slightly when the pie is given a little shake). If the crust seems to be browning quicker than the pie is cooking, you can cover the crust with a pie shield or some foil.
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Allow the pie to cool at least 2 hours so the filling can set.
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Serve at room temperature or cold, and top with whipped cream or ice cream, if desired.
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Store leftovers in the fridge.
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Enjoy!