Searching for easy-to-make, heat-and-eat meals for my husband!?

My husband is a Marine who needs to maintain a body weight of about 240 pounds. He has a very high metabolism, so it is very hard for him to gain weight and maintain it (I know right, boo hoo, haha.) so he has to eat a full meal every 2 hours. While I am not chained to the kitchen, I do still want to help him. So, I'm searching for easy meal ideas (preferably one-dish meals) that can be stored in the fridge, then nuked in the microwave and eaten. So far, we make a lot of pasta salad and chili but I don't want him to get bored--any ideas?