"Get creative and decorate these bars in a plaid pattern. You can also ice them in a solid color and add sprinkles...."
INGREDIENTS
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2 1/2 cups all-purpose flour
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1/2 tsp baking powder
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1/2 tsp salt
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1/2 cup unsalted butter, softened
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1 cup granulated sugar
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1 large egg
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1 large egg white
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2 tbsp sour cream
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1 tsp vanilla extract
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Vanilla Frosting (see in notes)