Cooking for one (or even two) has long been a challenge. When I was on my own I made main dishes that could put into the freezer. I would make 3 or 4 different dishes, package them into small servings and freeze them. When I was ready to eat them I added fresh salad, veggies and a dessert. There used to be a number of cookbooks specifically designed for cooking for one or two people, copies of which may still be available.