“You have to pick five foods for you and Maisy to be restricted to eat for the rest of your lives. If you pick chicken you can have all kinds of chicken, grilled, fried, etc but a chicken and bacon club sandwich counts as more than one food. You can add all types of spices to every meal. What five foods do you pick?”
Your question is a little confusing because I'm allowed to have the foods prepared some ways but not others. For example fried chicken would need to be battered and maybe breaded. Can I have any amount of flour without flour being one of my ingredients? What about bread crumbs? If I can have bread crumbs, do I automatically get bread?
Assuming that the question is about choosing five key ingredients and discludes dessert, (with sugar, flour, cream, and eggs you can make a ton of amazing stuff) here is my list.
Chicken
Steak (which could be ground into ground beef)
Potatoes
Cheese
Lobster
With that and spices - I'd only be really really really sad... not suicidal.