Is there such a thing as a healthy frozen meal?
Yes, it's called ice cream.
Well, maybe not healthy, but it tastes so good, and hardly any preparation.
Actually I do think many frozen vegetables are good, I find consistent quality with major US brands like BirdsEye. And they microwave quick and easy, some in their own single-serving steamer pouches, though that's a more expensive cost per ounce than buying a large bag and resealing in plastic containers.
As for the main course I'm a big fan of supermarket rotisserie whole chickens. They're already cooked and hot when you bring them home, just heat up your veggies in the microwave while you carve. Good source of protein and no greasy frying.
The leftovers in the fridge can provide a single guy several more meals, either cold in sandwiches, salads, or warmed in the micro. I cover it to reduce drying out when reheating. And in many stores those chickens are between $6 and $7, you get about 3 or 4 meals and they did the original cooking for you. I think a great choice for keeping your kitchen time to a minimum, relatively low cost and healthy, so long as you like chicken.
If baked potatoes are on your diet you can mic them, too, for a quick meal that's leaves you with almost no clean-up, especially if the veggies are in steamer pouches. The potatoes take the longest, about 7 minutes for 1 medium size, so I start them first, the veggies next.
Clean the potato in its skin, and perforate with a fork in a few places. Wrap it in a plain white paper towel, safe for microwaving (some print designs get too hot). Place right on the turntable and cook 7 minutes, turning it once halfway through. You'll need to experiment based on potato size and oven power.
Next you place the potato on a sheet of aluminum foil and remove the paper towel, then wrap the potato tightly. Now you can cook your vegetable, most single-serving pouch varieties needing about 2-3 minutes. I really like that method, BTW, the steaming inside the sealed pouch helps preserve a fresher taste, and there's no pot or container to clean, the veggies go right onto your plate.
The potato will sit in the foil for 5-10 minutes while you complete everything else, the last item to go on the plate.
For other kinds of meats when we're lazy or pressed for time we'll resort to our Foreman countertop grill, which does an adequate if not outstanding job on steaks, pork chops, chicken breasts, etc. The results are fairly quick and consistent once you've done it a few times. Our model has removable non-stick cooking surfaces that go right into the dishwasher, because otherwise cleanup can be a chore with those grills.
Hope you're getting some info in this thread you can use, and bon appetite!