Peanut butter and mayo on white bread.
Peanut butter and grape jelly on white bread.
Any form of grilled cheese.
Or butter on saltines. Of course, growing up, it was margarine. When I indulge today, it’s butter.
Another not-a-sandwich-but-a-guilty-pleasure: Pie crust scraps. Mom always eyeballed the pie crust ingredients, never measured, so sometimes there was a lot left over, sometimes a little. Mom rolled it out and cut it into strips with a fluted pastry wheel. Thank god Pillsbury refrigerated crust doesn’t taste anywhere as good as Mom’s.
Double decker pb&j.
When I used to eat meat: Braunschweiger, Miracle Whip (THIS THICK!) Velveeta (THIS THICK!)
Sometimes I’d make peanut butter and sugar sandwiches when home alone, or just sugar on bread. I can’t bring myself to make one now, but I’d probably still like it.
As I learned from Casey Jones, adding a layer of potato chips makes any sandwich a “chipwich”.
It’s never better than with peanut butter and jelly, tho.
Ever try peanut butter and mustard? I swear by it. Especially on an English muffin.
Fairy bread.
I mean, I wouldn’t make it for myself… but I seem to be attending more children’s parties these days that I have for years, and if it’s there, I’ll have a slice 
I still like grilled cheese best if it’s on some kind of white bread with American cheese.
to me, more adult versions of grilled cheese (like with different cheeses and/or other things added) just aren’t as good. Other cheese has its place in the world, but it’s not on a grilled cheese sandwich.
So many people have mentioned the peanut butter and mayo sandwich to me, but I’m too scared to try it. Peanut butter and mayo are not supposed to be mixed! That’s like putting Cool Whip on a club sandwich!
Another sandwich I like: cheese, onion, pickle, and mustard on whole wheat. Yellow mustard is fine, but use some Dijon for a bit more spice.
Peanut butter, banana, and bacon. Mmm mmm mmm. Though one time my mother made me this with mayo too. Ack!
We also used to trade potato chips and cookies, and stuff them in our sandwiches too. Cookies?!?!
It’s funny how many people here have peanut butter as their guilty secret.
For me, it’s honey and marmite. Sort of sweet and sour. Yumm!
Grilled cheese, made with Kraft singles or Valveeta, with pickles or pickle juice rubbed on the butter-fried bread. I don’t eat pickles, but I acquired a taste for the juice on my grilled cheese when I ate as Winky’s at a child. They’d put pickles on the sandwiches, and I’d peel 'em off, but it still tasted like pickle.
Sure.
However, as with sex, you always want some variety. Sometimes it’s just you and the can, sometimes you want more people there.
You gotta try it fancied-up – seared Cajun style! Maybe some Dijonnaise, if you’re real adventurous.
I seen some other food posts by you; we seem to have a similar proletarian food background.
Fried egg and ketchup and Sea dogs: tuna salad with relish and crushed potato chips on a hot dog bun
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Grilled cheese made with THICK slices of Velveeta, on white Home Pride bread, fried up with copious amounts of butter (actually, back when I was a kid, it was more likely copious amounts of margarine).
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Peanut butter sandwich, made with Jif crunchy, on soft white or wheat bread, served with a side of either Nacho Cheese Doritos, or (my preference) Cool Ranch Doritos, plus a few crunched up and pressed into the sides of the bread so as to add even more crunch/flavor.
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White bread slices with several pats of butter (or, again, margarine) per slice, toasted on a tray in a 300° oven for ten minutes; then, at the table, taking a decent sized forkful (or two) of your mom’s “homemade” spaghetti with meat sauce (spaghetti cooked to within an inch of its life; hamburger; and a jar of Ragu original, natch), placing it on a slice of the toasted, buttered bread, and covering with another slice of said toast. Heaven.
Also, upon re-watching season six of The Sopranos, I think I may have to sample a Lincoln log sandwich (or two).
Peanut butter and cream cheese sandwich on toast is mine … I wonder if I have any cream cheese in the fridge, that suddenly sounds good for lunch.
As a kid, I learned to make FlufferNutters with little mini marshmallows instead of the jarred stuff. And as fas as still enjoying them … I made one to bring to the office with me today for lunch. It’s not even 10:00 am and I’ve already snuck a couple of bites. I have no shame.
Oh, and it has to be crunchy peanut butter. Extra crunchy, if available.
Mr. Horseshoe and I often have a grilled cheese - white bread, Kraft singles, cooked in butter - for lunch. I never thought of it as a guilty pleasure. I just think of it as “lunch.” We usually just split one, anyway - his half involves pickles, my half involves ketchup.
Pimento and cheese sandwiches on Wonder bread, hands down. The pimiento and cheese has to be made with half grated cheddar, and half grated Velveeta. Then dump in a jar of pimentos and a bunch of mayo, salt and pepper it, and stir it up. Yum!
Add my votes to both grilled cheese and fluffernutters. It makes me sad to know that there are people out there who have never known the joy of the fluffernutter.