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, then rub the seasoning blend evenly over all surfaces of each thigh.
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 turns deeply golden and crisp. Flip each piece and sear the opposite side for 2 minutes. Transfer the chicken to a plate and set aside.
04 - In the same skillet, add the chopped onion and sauté over medium heat for about 2 minutes until softened. Add the minced garlic and cook for 1 minute until fragrant, stirring constantly to prevent browning.
05 - Pour in the chicken broth, using a wooden spoon to scrape up any browned bits from the bottom of the pan. Stir in the heavy cream and grated Parmesan cheese, continuing to stir until the sauce is smooth and slightly thickened, about 2 minutes.
06 - Nestle the seared chicken thighs back into the skillet, skin side up, arranging them in a single layer. Spoon some of the cream sauce over the top of each thigh to baste.
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 from the oven and let rest for 2 to 3 minutes. Garnish generously with fresh chopped parsley and serve immediately while hot.