Blend dry cake mix, butter, and 1 egg. Press into ungreased 13x9x2 pan.
Beat cream cheese until smooth. Gradually blend in powdered sugar. Stir in peel and lemon juice until smooth. Reserve 1/2 cup; refrigerate. Beat 2 eggs into remaining cheese mixture until blended.
Spread over cake mixture. Bake at 350 F until set, about 25 minutes; cool completely. Spread with reserved cream cheese mixture. Refrigerate until firm.
Serving Size: 12.