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Preheat the oven to 350.
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Line an 8x8 baking dish with parchment paper.
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Bring 1 cup of apple cider to a boil over medium heat, then reduce the heat and allow to simmer for 15 minutes or until the cider has reduced to a half a cup.
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Add the chunks of butter into the hot cider and let it melt.
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Set aside and allow the buttery cider to cool for 5 minutes.
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Add brown sugar to the butter/cider mix and whisk to mix.
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Add the egg and whisk until blended.
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Add vanilla, cinnamon, apple pie spice, baking powder, salt and mix until well incorporated.
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Add oats and flour and stir until well blended.
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Pour the batter into the prepared baking dish.
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Bake for 25-30 minutes.
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Remove from the oven, allow to cool for 10 minutes.
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Mix the sugar and cinnamon together in a small bowl.
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Brush the top of the blondies with melted butter then sprinkle the cinnamon sugar over the top.
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When the blondies have cooled, cut into 16 squares and enjoy.
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Store in an airtight container for up to 4 days.