Sheet Cake with Sour Cherries

Ingredients (12 items)

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