01 - Pat chicken thighs dry and season both sides with salt and black pepper.
02 - Heat olive oil in a large skillet over medium-high heat, place chicken thighs skin-side down and sear for 5 to 7 minutes until golden brown; flip and cook 3 to 4 minutes more. Remove chicken and set aside.
03 - Discard excess fat from the skillet, leaving about 1 tablespoon. Melt butter over medium heat.
04 - Add sliced mushrooms to the skillet and cook for 4 to 5 minutes until browned and tender.
05 - Stir in minced garlic and thyme, cooking for 1 minute until aromatic.
06 - Pour in chicken broth and scrape any browned bits from the bottom of the pan; simmer for 2 minutes.
07 - Reduce heat and stir in heavy cream and grated Parmesan; simmer gently for about 3 minutes until sauce is slightly thickened.
08 - Nestle chicken thighs skin-side up into the sauce and spoon sauce over them.
09 - Cover skillet and simmer on low for 15 to 20 minutes until chicken is cooked through, reaching an internal temperature of 165°F.
10 - Sprinkle chopped fresh parsley over the chicken before serving.