Pat chicken dry. Toss with half the salt, pepper, paprika, and thyme.
Heat olive oil in a large skillet over medium-high heat.
Sear chicken in a single layer until browned and cooked through, 5–6 minutes, stirring once. Transfer to a bowl.
Melt butter in the same skillet. Add mushrooms and cook until golden and most liquid evaporates, about 5 minutes.
Stir in garlic and the remaining seasoning. Cook until fragrant, about 30 seconds.
Deglaze with broth, soy sauce, and Worcestershire. Scrape up browned bits and simmer to reduce slightly, 1–2 minutes.
Return chicken and any juices to the pan. Toss to coat and warm through. Stir in lemon juice.
Finish with parsley and red pepper flakes. Taste and adjust salt if needed; serve hot.