BBQ chicken is the easy one - just throw in seasoned chicken, cover with bbq sauce and you’re good to go.
I make some pretty good crockpot meatballs but they’re sort of a pain. First, I make the meatballs by hand and then cook them in the oven for like 5-7 minutes to get them browned. I use lots of fresh garlic and ginger in the meatballs and then pretty basic ingredients otherwise. Then I put them in the crockpot with a sauce of soy, brown sugar, chili flake, tapatio and hoisin. Making the meatballs is just a bit time consuming.