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In a mixing bowl, with the electric mixer, beat sugar and butter until light and fluffy.
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Add egg, mix it. Add baking powder, cinnamon powder, salt, vanilla extract, mix it well.
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Add flour, mix it until all well blended.
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Cover the bowl with plastic wrap, refrigerate the dough for two hours.
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Preheat the oven to 350°F.
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Prepare the baking sheet, layer it with parchment paper.
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Prepare the sugar and cinnamon powder in the bowl.
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Take the dough out of the fridge, roll the dough into a 1-inch ball, then roll it on the cinnamon sugar mixture.
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Bake it for 10-12 minutes, until the bottom of the cookies gets slightly brown color.
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Leave it cool for five minutes on the baking sheet, then move the cookies on the wire rack to cool.