I came up with this list while trying to think up what kind of foods would be good while watching different Marvel movies awhile back, and the most obvious choices are the ones that are already in the film itself! If anyone is planning to do a watch-through, these might be some clever ways to make it a bit more interactive of an experience.
Fondue for Captain America, cheeseburgers for Iron Man, donuts for Iron Man 2, shawarma for Avengers, ice cream for Ant-Man, tacos for Avengers: Endgame, cheetos for She-Hulk, pizza and macaroni for Hawkeye, key lime pie and McDonald's for Loki, corndogs for Agatha, breakfast food for WandaVision.
Shout out in the comments if I missed any!