01 - Pat the chicken thighs dry with paper towels. Season both sides generously with salt, black pepper, and smoked paprika, pressing the spices into the meat to adhere.
02 - Heat olive oil in a large skillet over medium-high heat until shimmering. Place chicken thighs in the pan, smooth side down, and sear for 5 to 6 minutes until golden brown. Flip and cook for an additional 3 to 4 minutes. Transfer chicken to a plate and set aside.
03 - In the same skillet, add sliced mushrooms and chopped onion. Cook for 4 to 5 minutes, stirring occasionally, until vegetables soften and develop golden color. Add minced garlic and cook for 1 minute until fragrant.
04 - Pour in chicken broth, using a wooden spoon to scrape up any browned bits from the bottom of the pan. Stir in heavy cream, Dijon mustard, and thyme leaves. Bring the mixture to a gentle simmer.
05 - Return chicken thighs to the skillet, spooning some sauce over the top. Simmer uncovered for 15 to 18 minutes until chicken is cooked through and internal temperature reaches 165°F. The sauce should thicken slightly. Stir in Parmesan cheese until melted. Taste and adjust seasoning if needed.
06 - Sprinkle chopped fresh parsley over the dish just before serving. Pair with mashed potatoes, rice, or crusty bread to soak up the creamy sauce.