Two types of meals that can easily be precooked in their entirety and heated up again are various types of stir-fry and chili. Try cooking up some chili or stir-fry for dinner once or twice a week. If you cook a big enough batch, you'll get a great tasting dinner plus leftovers that you can refrigerate and then warm up for easy, delicious lunches all week long.
I have a wonderful assortment of recipes I can share if you are interested in try them. Contact me to receive a complimentary recipe that will be sent to your email. Happy cooking!