Wash and rinse 4 to 6 pieces of deboned, skinless chicken thighs. Set aside.
In a bowl, combine soy sauce, Worcestershire sauce, rosemary, thyme, garlic and onion, salt and pepper. Put in the chicken pieces, and rub for a minute or two.
Store the marinade in the refrigerator, ideally for 6 hours.
To prepare black pepper sauce, heat oil in a pan, and sauté the chopped onion and minced garlic until they turn golden.
Later, add Worcestershire sauce, sugar, beef broth, salt, and flour. Stir well for a few minutes.
To prepare mushroom sauce, melt 1 butter in a pan, and add sliced mushrooms, salt and pepper, oyster sauce, chopped onion, and beef broth.
Cook the sauce for a few minutes on low-medium heat.
Whichever sauce you’ve decided to go with, pour it over the chicken chops.
Serve hot.