I have a few alternatives for my son if he won't eat ANYTHING I am fixing. I usually get the individual servings of mac and cheese from the freezer section. I don't like the powder and box stuff either, powdered cheese is scary. Stouffer's is the best if you can get it on sale, but it's kinda high priced for a box of noodles. Marie Calendar has some that isn't bad and every so often I can get those 5 for 3 dollars so I stock up then. Ravioli is another favorite, and chicken noodle soup. I usually have a side of the individual applesauce cups to go along with them. Vegetables are a challenge, but mine loves green beans and those little frozen ears of corn are easy to fix individual for him. Mine won't eat potatoes, even french fries. So the applesauce fills in a lot. Example ... we have steak and baked potatoes I will usually fix green beans then, he will eat a little of the steak, usually cut from mine and green beans with applesauce. Chicken tenders are good for a quick fix with the little corn and maybe some apple slices.
Good luck! Been there.
