include a protein and some veggies and sometimes even a carb, like potatoes. Some sheet pan meal ingredients are cooked all at once, while some elements that require more cooking time (like potatoes) might go into the oven first with the faster-cooking ingredients (like veggies and fish) go in a bit into the cooking process.  No matter what your sheet pan dinner is, the best part is you will only have one dish — the sheet pan — to clean at the end. And, that, to me, is the best part!