Cookies.
When I was a kid, we'd just have store bought ones around - Fig Newtons and Oreos, certainly, but also some oatmeal and chocolate chip, or just sugar cookies. Nothing too interesting from my perspective now, but I'm sure I enjoyed all of them then. I was probably less enamored of the Fig Newtons, though. I never enjoyed eating as many of those in one sitting as I did others.
Fast-forward to getting out of school and moving to L.A. -- I'm pretty sure the next kind of cookies I warmed up to were Mrs. Field's chocolate chip, when I was out and about, and a little later, David's, which seemed even better to me although I never compared the two side by side. I never did develop the habit of keeping cookies around at home, though. I didn't have that kind of sweet tooth in those years.
Later, I'd start buying the dry mixes at the supermarket and making some from those now and then. I really liked doing that, and controlling how chewy or crisp they'd be. Definitely love the chewy, always and forever. Oatmeal raisin and peanut butter were favorites, and those really are my favorites today, regardless of the source.
In recent years, it's store bought ones, but the type from the bakery departments, not the packaged national brands. An exception to that is an occasional purchase of Oreos. I especially like the mint ones because the flavors remind me of the Girl Scout thin mints. Lately, though, post-pandemic, I've been so pissed at the downsizing AND price increase on the bakery ones I liked that I've bought very few.