I like macaroni and cheese
Me too! I assume you are either American or Canadian as they call it mac and cheese while Caribbean English calls in macaroni pie.
Am Canadian. That is true
Same here. Do you like to add other ingredients like breadcrumbs, meat and veges? 
I like to add shredded Chicken and veges 
What about cooking method? I like to bake it in an oven as opposed to cooking it in  a sauce pan on a stove.
Same here
In the States, it is highly acknowledged as comfort food. What do you think?
Really?
Comfort food
Comfort food is food that provides a nostalgic or sentimental value to someone, and may be characterized by its high caloric nature, high carbohydrate level, or simple preparation. The nostalgia may be specific to an individual, or it may apply to a specific culture.
Definition.
The term "comfort food" has been traced back at least to 1966, when the "Palm Beach Post" used it in a story: "Adults, when under severe emotional stress, turn to what could be called
Macaroni and cheese
Macaroni and cheese—also called mac and cheese or mac n cheese in American and Canadian English, macaroni cheese in the United Kingdom—is a dish of English origin, consisting of cooked macaroni pasta and a cheese sauce, most commonly cheddar. It can also incorporate other ingredients, such as breadcrumbs, meat and vegetables.
Traditional macaroni and cheese is a casserole baked in the oven; however, it may be prepared in a sauce pan on top of the stove or using a packaged mix.