Ingredients Directions 1. Preheat oven to 350 degrees and grease 3 8-inch pans. (I like to line the bottoms of my pans with foil or parchment for easy removal.) 2. Sift cake mix into a small bowl and set aside. 3. In a large bowl, combine eggs, butter, lemon zest, lemon juice, buttermilk and yogurt until smooth.