Lemon Sheet Cake is heavenly. This fluffy, lemony cake includes a lemon cake mix and lemon pie filling in the batter. The cream cheese icing includes lemon extract and zest. It’s a totally delightful lemon dessert experience that will have you drooling from the first bite. Perfect dessert for tailgating or office parties, family reunions, potlucks or special occasions like birthdays or baby showers.