My Dad used to make those for my brother and I saturday mornings for breakfast when we were fairly young, then he taught me how to do it when I was about 8 =)
If you like those, try buying thick cut mortadella from a good deli, about half an inch thick and grill it up in a foreman type grill. About a quarter slice of the large diameter mortadella makes a good sandwich after grilling. The chunks of fat get that crispy meltyness that is fantastic with thick cut sourdough bread or thick cut rye 
Our family didn’t have a lot in the way of cash when I was a kid. The closest thing I have to comfort for is PB&J. Cruchy peanut butter and stawberry preserves. I still eat it.
I ought to post this in the “innocuous things you have a bad association with thread”, but I could never stand bologna after the first time it was offered to me was in a house that stank with the unwashed body of an immobile person. It doesn’t help that bologna smells somewhat like that naturally!
LOL! I used to cook up those German Prussia Kaiser Hohenzollern War Medals all the time!
Little Debbie snack cakes. Zebra cakes, in particular. As an adult, I think the outer coating tastes very waxy and plasticky, but it was sweet and delicious when I was an unsophisticate.
Not for the faint of heart, a classic Asian comfort food, fried dace with black beans. Heated right in the can and dumped over rice. It looks really gross, I know, and upon having it now I realize how incredibly salty it is, but I’ve still gotta have it every now and then.
When I was a young teen and in my bottomless pit years, I’d make an egg salad sandwich with chopped green onions on white bread every day when I got home from school. This sandwich with a glass of raspberry Kool-Aid was what I craved for about two years straight.
And seconding the “OMG that sounds good” regarding the coconut toast upthread.
I used to love Velveta shells and cheese, but haven’t had it in 15 years.
I did get to have one of my biggest childhood comfort foods just last week while in Hawaii with my parents: Hominy. You can’t find it here in Canada any more, but we found both white and golden hominy in the Safeway there and fried some up for one of our dinners. We put pure maple syrup on it and it’s just as good as I remember. I bought two cans and brought them home with me for a special treat.
I remember Twinkies tasting better when I was a kid. I loved 'em. Now I won’t touch 'em. Did they really change, or did I?
I guess that I’m an unsophisticate, because those things are crack to me.
The smell of an ordinary breakfast (which I seldom make) - bacon, eggs, toast, coffee - takes me back to long-ago Sunday mornings. A little strawberry jelly on the toast, too.
The packaged lunch meat - ham? bologna? - with little flecks of cheese, on white bread with mayo, potato chips and sweet pickles on the side. (sigh). I could eat the same thing today, every day, but don’t.
Moving thread from IMHO to Cafe Society.
My grandma used to make Tombstone sausage pizza for lunch, and me, mom, my little brother and grandma would all share one pizza. We’d each get 2 slices and I always wanted more, but there wasn’t more. Honestly I still love Tombstone pizza but my husband turns his nose up at it and I don’t have Grandma around any more. I bet my mom would eat it with me, and I’m making a mental note to get one for when mom visits when my baby’s born.
Fish sticks with bottled lemon juice and ketchup! I can’t wait to have a toddler so we can eat fish sticks together.
The Grandma comfort food thing I still make that my husband loves is split hamburger buns with cheddar, cubed tomatoes and crumbled bacon broiled until the cheese is melted and the edges of the bun are almost burnt. They are so, so good for lunch.
One of my comfort foods, from when I was a kid, is still as good as it ever was;
Fresh homemade bread, buttered (or margarine, whichever), dipped in molasses. I just never get the opportunity to get fresh (and I’m talking still warm) homemade style bread. I guess I’ll have to teach myself how to make some.
One thing I remember us having when I was little was shrimp chips. Not the ones that come in a bag, puffed. These looked like smooth plastic chips, and you fried them, and they puffed up.
I go to Edmonton every once in a while, and there’s the T&T Supermarket, at the West Ed Mall. I’ll have to check it out, see if they have them.
I eat that every Sunday, now. 
I also loved bologna sandwiches, but you do have to cut them a certain way or they don’t cook right.
We had Spam as a kid frequently too. Also salmon patties. Always hated both, will never eat either one ever again. (Unless zombies attack.)
Personally, fried bologna is on my “meh” list. I mean, if my husband is making up a fried bologna sandwich for himself, and he offers to make me one as well, I’ll turn it down more often than accept it. I never had it growing up, so it’s not a comfort food for me. I’ll tell him about the mortadella, though, he’d probably like it.
I used to love the frozen minced fish sticks and patties, but they just don’t do it for me any more. If I get frozen breaded fish, then I want filets, I don’t want the stuff that’s minced and then molded back together.
