Margarita Cake with Key Lime Cream Cheese Frosting

INGREDIENTS

• 1 (18.25 ounce) package white cake mix
• 3 egg whites
• 1 (10 fluid ounce) can frozen margarita mix (such as Bacardi®), thawed
• 2 tablespoons vegetable oil
• 1 tablespoon grated lime peel
• 1 tablespoon lime juice
• 1 (8 ounce) package cream cheese, softened
• 1/2 cup unsalted butter, softened
• 1 tablespoon grated lemon peel
• 5 cups confectioners' sugar