Light, easy meals.

My parents eat a lot of Lean Cuisine.

Perhaps cook a side dish for a week long, already prepared dish and then supplement that with a protein of the day. Maybe a giant dish of roasted vegetables - squash, sweet potato, red potato, carrots, peppers, red and yellow onions, asparagus, garlic, cauliflower, broc, and anything else that's there with some olive oil and butter.

Then just supplement that with steak night, fajita night, smoked sausage night, salmon or tuna steak night, shrimp skewers, etc. Only dirty one pan per night and meal is cooked in less than 20 mins, or time it takes to grill and rest your meat.