Put chicken thighs in the crock pot. Put the next 9 ingredients on top (reserve the spinach and feta to add when serving). Stir to combine. Cook on low 4-6 hours or on high 2-3 hours until the chicken is done.
To serve put a big handful of spinach in a bowl, add 1-2 chicken thighs (I use 2 for adults and 1 for kids), add in some of the other yummy things from the pot like artichokes and olives, and top with a few scoops of cooking liquid to wilt the spinach. Sprinkle some feta on top.