INGREDIENTS
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FOR THE SUGAR COOKIE BARS:
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1 3/4 cups all-purpose flour
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1 1/2 teaspoons cornstarch
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3/4 teaspoon baking powder
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1/2 teaspoon baking soda
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1/4 teaspoon fine salt
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1 stick (4 ounces) unsalted butter, at room temperature
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2 ounces cream cheese, at room temperature
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3/4 cup granulated sugar
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1 large egg plus 1 egg yolk
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1 teaspoon vanilla extract
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FOR THE CHOCOLATE FROSTING:
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1 1/2 sticks (6 ounces) unsalted butter, at room temperature
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1 1/4 cups powdered sugar, sifted
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1/3 cup cocoa powder, sifted
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3 tablespoons heavy cream
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1 teaspoon vanilla extract
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1/8 teaspoon salt
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Rainbow sprinkles