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