INGREDIENTS
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4 tablespoons unsalted butter, melted and cooled, plus more for greasing the pan
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1/2 cup all-purpose flour, plus more for dusting the pan
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1/2 teaspoon ground cinnamon
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1/8 teaspoon baking powder
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Pinch kosher salt
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1/4 cup granulated sugar
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1/2 teaspoon pure vanilla extract
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2 large eggs, room temperature
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1 tablespoon confectioners' sugar