Mile High 7UP Powdered Sugar Pound Cake! The powdered sugar in this moist pound cake gives the cake a fluffy, smooth and soft texture that's so delicious! 1 pound (4 sticks) butter, room temperature 6 cups powdered sugar, sifted after measuring if lumpy 1 tablespoon vanilla extract 2 tablespoons lemon extract 2 tablespoons lime extract 1 teaspoon baking powder 1 teaspoon salt 8 large eggs, room temperature 4 1/2 cups cake flour 3/4 cup 7UP or lemon lime soda, room temperature Preheat oven to 300