I am confused. Are they actually kosher, in which case you'd want to pick up something from a kosher restaurant and drop it off still packaged, or are they somehow partially kosher where they don't care how the meat was slaughtered, or if the kitchen is kosher, but still separate milk from meat?
If the latter, a roast chicken with veggies, prepared without butter, or with vegan butter, is always a nice thing to have because it's good later for leftovers too.
This salad, without the feta, or with vegan feta if you want to be fancy, is lovely and full of fall flavors. It would be a great balance for a chicken with potatoes, carrots and onions.
https://cookieandkate.com/roasted-delicata-squash-pomegranate-arugula-salad/
This vegan feta is good, but it would be fine without:
https://rainbowplantlife.com/greek-style-vegan-feta/