Preheat oven to 350℉.
Pat chicken dry with paper towel and place on a large plate or platter
Combine 1 teaspoon of salt, ½ teaspoon of pepper,1 teaspoon of onion powder, 1 teaspoon of garlic powder, 1 teaspoon of thyme,1 teaspoon of oregano, and 1 teaspoon of parsley. Rub this mixture on both sides of the chicken.
Heat olive oil and butter over medium heat in a large oven-safe skillet. Once the oil is hot, sear chicken thighs skin-side down for 5 minutes, until golden brown. Flip and cook another 5 minutes. Remove the chicken and set aside.
In the same pan, add the chopped onion and sauté for 3-4 minutes until softened. Add the minced garlic and cook another 1-2minutes, until fragrant. Next, add the sliced mushrooms and sauté until they release moisture and brown.
Stir in the rice and toast for 1-2 minutes.
Pour in chicken broth, cream of mushroom soup, heavy cream, the remaining onion powder, garlic powder, thyme, oregano, parsley, and salt. Stir until well combined.
Nestle the seared chicken thighs into the rice mixture, skin side up. Make sure they’re partially submerged in the creamy broth.
Place the skillet in the oven and bake for 1hour, until the rice is tender, and the chicken is fully cooked.
Remove from oven and rest for 10 minutes before serving. Fluff rice with a fork. Garnish with fresh parsley, if desired.