This Two-Ingredient Lemon Cake is a light, sponge-like dessert made simply with angel food cake mix and lemon pie filling—no eggs or oil required. It bakes up golden and airy in about 20 minutes, and can be topped with whipped cream and fresh berries for a festive, flavor-packed finish. Whether you're keeping it casual or dressing it up for a celebration, this easy recipe delivers citrusy charm with almost no prep.