Preheat oven to 425 degrees.
Heat a cast iron or enamel skillet over medium heat. Add 2 tbsp oil. Pat the chicken dry with a paper towel and season with salt and pepper. Add to the pan, skin side down first. After about 5 minutes, when the chicken releases from the pan without tearing, flip to the other side and cook an additional 3-5 minutes.
Remove chicken from the pan and let rest on a platter. Using a dry paper towel, blot any excess fat from the pan. Add another tablespoon of oil and the sliced red onion to the pan.
Cook the onion until lightly caramelized and soft, stirring often, about 10 minutes. Then add the minced garlic and saute for 1-2 minutes until fragrant.
Add the blood orange juice and zest, chicken stock, dijon and honey to the pan. Stir until all incorporated. Add the chicken back to the pan along with any juices on the platter. Scatter the green olives and thyme around the pan and top the chicken pieces with sliced blood orange.
Place the cast iron skillet in the preheated oven. Cook until chicken thighs reach 160, checking with a meat thermometer, or until the juices run clear if pierced, roughly 15 minutes. If using chicken breasts as well, remove the chicken thighs from the pan while the chicken breasts continue cooking to reach 160 degrees. Remove from oven and cover with foil while the chicken temperature continues to climb to 165 degrees.
Serve over couscous and garnish with blood orange segments!