01 - Pat the chicken thighs dry with paper towels. Season both sides generously with salt, black pepper, and smoked paprika, ensuring even coverage.
02 - Heat olive oil in a large skillet over medium-high heat until shimmering. Place chicken thighs in the skillet, cooking the presentation side first for 5–6 minutes until deep golden brown. Flip and cook an additional 3–4 minutes. Transfer to a plate and set aside.
03 - In the same skillet, add mushrooms and onion. Sauté for 4–5 minutes, stirring occasionally, until vegetables are softened and golden. Add minced garlic and cook for 1 minute until fragrant, being careful not to burn.
04 - Pour in chicken broth, using a wooden spoon to scrape up any browned bits from the bottom of the skillet. Stir in heavy cream, Dijon mustard, and thyme leaves. Bring the mixture to a gentle simmer, stirring to combine.
05 - Return the seared chicken thighs to the skillet, nestling them into the sauce. Simmer uncovered for 15–18 minutes over medium-low heat, or until chicken reaches an internal temperature of 165°F and the sauce has thickened slightly.
06 - Remove skillet from heat. Stir in grated Parmesan cheese until fully melted and incorporated. Taste and adjust seasoning with additional salt and pepper if needed. Sprinkle with fresh parsley just before serving.