This sheet cake is a perfect dessert for a crowd. The combination of sweet strawberries and tart rhubarb is a delicious addition to a moist and fluffy cake. To make this cake, start by mixing together flour, sugar, baking powder, and salt. In a separate bowl, mix together eggs, milk, and melted butter. Combine the wet and dry ingredients, then fold in chopped strawberries and rhubarb. Pour the batter into a greased baking sheet and bake until golden brown. Once done, top with a cream cheese frosting and enjoy!