1
In a large bowl, beat the softened butter and granulated sugar until smooth and creamy, about 2 minutes. Add the egg and vanilla extract, beating until fully combined.
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2
Mix together the flour, baking powder, and salt in a medium bowl.
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3
Gradually add the dry ingredients to the wet ingredients, mixing until a soft dough forms.
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4
Mix cinnamon sugar ingredients together, then sprinkle the mixture on top of the melted butter. Roll up each rectangle tightly, wrap in plastic, and chill in the refrigerator for 2 hours.
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