Marinate the Chicken: In a bowl, season chicken with garlic powder, onion powder, oregano, thyme, salt, pepper, and oil. Mix well to coat evenly.
Pan-Fry the Chicken: Heat a large pan over medium heat. Pan-fry the chicken for 5 minutes per side, until golden and cooked through. Remove from the pan and set aside.
Sauté the Aromatics: In the same pan, melt butter. Add green onion whites, mushrooms, and garlic. Sauté for 3–4 minutes, until mushrooms are softened and lightly golden.
Make the Sauce: Pour in chicken stock and heavy cream. Stir well, then add miso paste and mix until fully dissolved. Bring to a gentle simmer.
Finish the Dish: Add the chicken back into the pan. Simmer for 3–4 minutes, spooning the sauce over the chicken until everything is rich and creamy.
Serve & Enjoy: Serve hot with rice, pasta, or crusty bread.
