The candidate: Peanut butter between Thin Mints from the analog TedQuarters kitchen. Prepared annually whenever we run out of Tagalongs.

The construction: A dollop of Skippy creamy peanut butter sandwiched between two Thin Mints.
Arguments for sandwich-hood: It’s a familiar, incontrovertible sandwich filling — peanut butter — sandwiched between two identical (and carby) items.
Arguments against: The things doing the sandwiching are cookies. Also, it’s hard to argue that the peanut butter is the focus of the sandwich here: It’s not really the dominant taste so much as a binding agent connecting two delicious Thin Mints. You probably wouldn’t call this a “peanut butter sandwich on Thin Mints” unless you were trying to be cute with it.
How it tastes: Oh, it’s great. It’s a bit messy — Thin Mints are not meant for containing peanut butter, so the peanut butter slides out when you bite into it and you wind up having to lick off the little ring of peanut butter that forms around the sides. But that’s fine, because it’s delicious peanut butter.
But when you get the bites that are both Thin Mint and peanut butter, they’re awesome. Obviously I don’t need to tell you how great peanut butter and chocolate go together, and presumably if you’re familiar with the Thin Mint you’re also familiar with the Tagalong and you know how well Peanut Butter and Chocolate combine with the crunchy texture of a cookie.
I’m not even a big mint guy (well, I’m a big, totally mint guy, like in the 1980’s sense; I don’t generally love things that are mint-flavored, is what I mean to say), but throw in that little hint of cooling mint flavor with the warmness of the chocolate and peanut butter and the crunchiness of the cookie and now we’re talking about f@#$ing dessert.
What it’s worth: Uhh…. I really have no idea. My wife buys the Girl Scout Cookies. Those things are expensive though. I suspect they have uncut cocaine in them. Also: How is it possible that the suggested serving size for Tagalongs is two cookies? It should be no less than seven.
The verdict: I’m conflicted, but I think not a sandwich. It has more to do with the bagel-and-cream-cheese thing than with this being a dessert. The peanut butter here is a nice complement to the Thin Mints, but this thing is primarily Thin Mints. For the purposes of this exercise, I’m willing to consider and devour ice-cream sandwiches, which I suspect are indeed sandwiches. I am that dedicated.