That is a hard question... I've never actually been able to think of a food and be like "yep, thats my favorite, no question about it". I often say that my favorite food is chili- specifically my dads homemade chili - extra spice. However! He also makes really good sloppy joes... and burgers are pretty good... and spaghetti! I used to always say that was my favorite. With meatballs of course.
I'm just going to go with my most recent answer to the question... chili.