Grill a few chicken breasts in the seasoning/marinade of your choice, microwave or better yet roast some veg e.g. broccoli and peppers, bake some sweet potatoes. Divide them into plastic tupperware for the week. Keep the first few in the fridge, stick the others in the freezer and defrost the night before.
Simple, easy, healthy meal with all necessary nutrition. It's what bodybuilders eat on a regular basis (but obviously in much bigger portions).