Here is a sandwich that I like to make when I don't want to cook that is easy.
French Bread (You can also buy french bread with rosemary or any other variety)
Provalone Cheese Slices
Mushrooms and bell peppers (optional)
I just slice the bread in half and spread mayo on both sides. Then place the roast beef on the bread and top with the cheese slices. You can saute sliced mushrooms in oil or butter if you want. Then I toast the sandwich in the oven shortly until the cheese melts and the meat is warm.
You can serve this with fruit, salad, or chips.