01 - Preheat oven to 400°F (200°C). Position the rack in the center.
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 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 to 4 minutes until the skin turns golden brown 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, sauté the chopped onion over medium heat 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 grated Parmesan cheese, continuing to stir until the sauce is smooth and slightly thickened.
05 - Return the chicken thighs to the skillet, arranging them skin-side up in the sauce. Spoon some of the sauce over the top of each thigh. Transfer the uncovered skillet to the oven and bake for 25 to 30 minutes, until the internal temperature of the chicken reaches 165°F (74°C) and the sauce is bubbly.
06 - Remove the skillet from the oven. Garnish with freshly chopped parsley and serve immediately while hot.