Baked potatoes are magic:
- Harvest them with fortune to get extra potatoes
- Cook them for a decent source of XP
- Compost leftovers for a good source of bonemeal (better than raw potatoes)
I usually have a bunch of farmland dedicated to potatoes, an XP-collecting furnace array to dump them into, and hopper most of them into a composter.
My other go-to in the most recent versions is dandelion/orchid suspicious stew for in-base food. Mushrooms auto-spread (or grow huge with bonemeal), one of the two flowers is farmable with bonemeal almost anywhere, and the saturation effect is insane. The inconvenience is fine when I'm hanging around my base, so I can either harvest materials all day without eating, or take a couple of nasty falls and fast-regen without having to eat a ton. I grab a stack of potatoes when I head out, and the rest of the time my potatoes are making me XP and bonemeal.