INGREDIENTS
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Butter, for pan
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1 box spice cake mix, plus ingredients called for on box
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2 tbsp. butter
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5 Granny Smith apples, finely chopped
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1/4 c. brown sugar
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1 tbsp. cinnamon, plus more for dusting cake
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1 tbsp. corn starch
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12 oz. jarred caramel sauce (about 1 1/2 cups)
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16 oz. cream cheese, softened
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8 tbsp. butter, softened
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2 1/4 c. powdered sugar
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1 1/2 tsp. vanilla extract