01 - Preheat oven to 400°F. Position the rack in the center of the oven.
02 - Pat the chicken thighs thoroughly dry with paper towels. Combine salt, black pepper, smoked paprika, dried thyme, and dried basil in a small bowl. Season the chicken evenly on all sides, pressing the spice mixture into the skin.
03 - Melt the butter in a large oven-safe skillet over medium-high heat. Place the chicken thighs skin side down and sear for 3 to 4 minutes until the skin is deeply golden and crisp. Flip each thigh and sear the opposite side for 2 minutes. Transfer the chicken to a plate and set aside.
04 - Reduce the heat to medium. Add the chopped onion to the same skillet and sauté for 2 minutes until softened and translucent. Add the minced garlic and cook for 1 minute until fragrant, stirring constantly to prevent burning.
05 - Pour in the chicken broth, scraping up any browned bits from the bottom of the skillet. Stir in the heavy cream and grated Parmesan cheese. Continue stirring until the cheese melts completely and the sauce is smooth and slightly thickened, about 2 minutes.
06 - Nestle the seared chicken thighs back into the skillet, skin side up. Spoon some of the creamy sauce over each thigh to coat evenly.
07 - Transfer the uncovered skillet to the preheated oven. Bake for 25 to 30 minutes until the chicken reaches an internal temperature of 165°F and the sauce is bubbly and golden around the edges.
08 - Remove the skillet from the oven and let rest for 2 to 3 minutes. Garnish generously with freshly chopped parsley and serve immediately while hot.