I make frozen meals as routine. First I went to the Dollar Store and bought lidded plates that can be both frozen and microwaved. They are divided into three sections.
One section I use for meat. Roast beef, meatloaf, pork chops and chicken freeze well. I add a little juice/gravy to them to keep them moist.
In the second section I put vegetables, already cooked and seasoned.
In the third section I put a starch, precooked rice, dressing, sweet potatoes, already cooked. Again I add something that keeps them moist, for example a little tomato salsa in the rice.
Use your imagination. You will come up with a number of things that work well.
The reason I do it is for easy-cooked meals. I may eat them twice a week. When I do, I'm grateful to have them.
As far as calorie counting, they are great. Your meals are already portioned - no second helpings available.