Rinse chicken thighs. Pat chicken thighs dry with paper towel and place in a large bowl.
Season chicken thighs with cumin, Italian seasonings, cayenne pepper, paprika, garlic powder, salt, black pepper.
Heat olive oil and butter in a cast iron skillet (10-inch) over medium heat. Place the chicken thighs skin-side down and sear for approximately 5 minutes. Then flip chicken and add sliced onions under each thigh (skin side up). Cook on medium heat for 5 minutes then place the cast iron skillet in the oven and bake for 30-40 mins until chicken reaches an internal temperature at 165°F.
Add butter and a pinch of salt in a medium size skillet over medium heat. Once butter has melted add mushrooms and sauté for 5-7 minutes.
Add mushrooms to the chicken, top with parsley and serve. Enjoy