Sheet Cake with Sour Cherries
Ingredients:
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2 cups confectioners' sugar
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1 cup unsalted butter
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2 tablespoons unsalted butter
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2 teaspoons vanilla sugar
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2 teaspoons fresh lemon zest
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¼ teaspoon salt
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4 eggs
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3 ¼ cups all-purpose flour
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4 teaspoons baking powder
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½ cup milk
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1 ¾ (16 ounce) cans pitted sour cherries, drained
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1 tablespoon confectioners' sugar, or as needed