This lemon poppy seed sheet cake recipe is perfect for those who want to feed a crowd. To make this cake, you will need flour, sugar, baking powder, salt, eggs, milk, oil, lemon juice, lemon zest, and poppy seeds. Simply mix all the ingredients together, pour the batter into a greased sheet pan, and bake for 25-30 minutes. Once the cake is done, let it cool before serving. This cake is perfect for parties, potlucks, or any other occasion where you need to feed a lot of people.