I liked Reese's better before they changed the recipe (I remember them tasting different when I was younger; sometime in the late 90s/early 00s they started tasting less sweet and less smooth, with kind of a sharp chemical taste - some of my other family members noticed it too). Thankfully, you can get peanut butter cups that taste pretty similar to what I remember at Cracker Barrel. Not made by Reese's, though.
Butterfinger, Peanut Butter M&M's, Caramel/Dulce de leche M&M's (although they were discontinued; if you can still get them anywhere, it would probably be at the M&M's World store), Twix, Snickers, Crunch, Krackel, Rice Krispie cookies*, Andes mints, York Peppermint Patties, Cadbury Creme Eggs, and more that I don't really care to continue listing.
*I'm grouping it with candy because they're not really 'cookies' in the traditional sense of using batter and being cake-like; you also don't have to refrigerate normal cookies.