Probably my all-time favorite comfort food is grilled cheese sandwiches and tomato soup. I vividly remember going to my aunt's house for the weekend and she would make grilled cheese sandwiches for me. They were always cut into triangles, and when I was there, I never had to eat my crusts! I cut my grilled cheese sandwiches into triangles to this day.
After that, I would have to say it's tuna on toast. My own creation, I ate it quite a bit in my twenties when money was tighter than tight. A can of tuna, a can of peas, and a prepared can of cream of mushroom soup. Heat together and pour over toast. It's filling, warms you up, and inexpensive.
Those are a couple of my favorite comfort foods...share yours!