With medium chicken thighs: with bone in, bake about 40 minutes. Put on rack if desired and after 20 minutes turn the meat. Oven temp 400 or 350 for a little longer.I assum … e you will be using herbs, etc.Hope this heps.he temperatures and how long you should cook it are on the box. Place the chicken on slide aluminum foil on a cookie sheet. I generally bake mine at 350 degrees for 35-40 minutes and then cut at the thickest point to see if the juices run clear.