I enjoy eating different kinds of food, but I have never thought about what my favorite one is. But if I have to choose one I would go with the "completos" or the "Chilean hot dogs" speaking in fancy words (hahaha). Basically, they are a sausage inside on a long piece of bread (hot-dog buns) and you can add to them any kind of sauce, vegetables or condiment you want. I really like their versatility and the different flavors that they get depending on your choices of sauces or vegetables, although, they are not very healthy so I do not eat them so often, but, I have to say, they are so delicious!
One example of Chilean hot dogs is the "Italian" which has avocado, tomatoes, and mayonnaise. Or the "German" which has "chucrut" (It is a condiment which consists of fermented cabbage in water with salt), tomato, and mayonnaise. There are many other types of "completos" but I would rather not think about them anymore because I'm getting hungry, hahahaha.