In a deep sautué pan over medium heat, warm the olive oil and butter.
Season the chicken with salt and pepper. Add the chicken to the pan and brown on all sides, about 7 minutes. Transfer to a platter.
Add the onion to the pan and cook until tender and translucent, about 4 minutes. Add the chicken, garlic, thyme, wine, stock, cumin and Worcestershire and bring to a boil.
Reduce the heat to low, cover and simmer until the juices run clear when the chicken is pierced with a knife, about 30 minutes. Serve immediately.