INGREDIENTS
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1/2 cup all-purpose flour
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1/2 cup old fashioned oats
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1/2 cup packed light-brown sugar
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1/2 tsp baking powder
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1/4 tsp ground cinnamon
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1/4 tsp salt
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1/3 cup unsalted butter, diced into small cubes
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APPLE FILLING: 2 lbs Granny Smith apples (at room temperature), peeled, sliced thin and diced
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2 2/3 Tbsp unsalted butter, melted*
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2 Tbsp all-purpose flour
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3 Tbsp water
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1 Tbsp lemon juice
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1/2 tsp vanilla bean paste or vanilla extract
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1/4 cup light-brown sugar
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1/2 tsp ground cinnamon
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1/8 tsp ground nutmeg
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1 pinch salt