1. Use the grill. You can cook only what you'll eat, and the mess is minimal.
2. Get out the skillet. It's just like grilling (only there's a bit more to clean). If you learn to saute, you can create simple meals for one in a single pan.
3. Make full recipes for sauces or soups, then freeze in batches. If you already have some favorite recipes, go ahead and make them on Sunday, freeze them in small portions in plastic containers and remove as needed during the next few weeks.
4. Pasta, pasta, pasta. I know it sounds boring, but if you cook enough pasta for a few meals, you can store it in the fridge for three to four days and toss it with different veggie and meat combos until it's used up. Simply cool the cooked pasta thoroughly under cold water, shake off the extra moisture in the colander and toss it with a touch of olive oil. Then store in small-portion bags.
5. Indulge yourself. Don't be afraid to buy yourself a nice piece of salmon or a juicy steak every once in a while. Both are easy to cook on the grill or stovetop or in the broiler, and without any marinades or sauces (extra work for you), they taste delicious.