Not really certain. It'll probably be porridge, yoghurt or scrambled eggs since those are the things I eat most often.
Maybe I'd also have a bowl of cereal with sugar on top. I haven't had that in years. Poached eggs with hollandaise sauce, a muffin, and spinach also sounds good, or a burrito, or a cheese and jam sandwich. Maybe hot buttered toast on cheap white bread. I never have white bread. I could also make brownies.
I wouldn't want to waste money on anything overly fancy, but I do like sushi. I also wouldn't want to go out anywhere right before I died, so that rules out a lot of stuff. I don't know why, but I'd like to be alone before I go.