Set your oven to 350°F (175°C). Grease your baking dish or cake pans with butter or cooking spray. Preparing the pan properly helps prevent sticking and gives you a neat cake edge.
In a large mixing bowl, add the cake mix, lemonade concentrate, eggs, oil, and lemon zest. Beat with an electric mixer for about 2–3 minutes until the batter is smooth. Don’t overmix—it can make the cake dense
Pour the batter evenly into your prepared pan. Bake for 30–35 minutes, or until a toothpick inserted into the center comes out clean. The kitchen will smell amazing at this point
Once baked, place the cake on a cooling rack for about 15–20 minutes. Make sure it cools completely before frosting—otherwise, the frosting will melt and slide off.
In another bowl, beat cream cheese and butter until smooth. Slowly add powdered sugar, lemon juice, and vanilla. Mix until you have a creamy, spreadable frosting. Taste and adjust lemon juice if you prefer more tang.
Spread the frosting evenly over the cooled cake. Sprinkle with fresh lemon zest on top for a lovely, refreshing finish. Slice and enjoy!