01 - Preheat your oven to 400°F (200°C). Line a large baking sheet with parchment paper or aluminum foil for easy cleanup.
02 - Pat the chicken thighs thoroughly dry with paper towels. Rub each thigh with olive oil, and season with salt and black pepper. Set aside.
03 - In a large skillet over medium heat, melt 2 tablespoons of the butter. Add the finely chopped onion and celery and sauté for 4-5 minutes until they begin to soften. Stir in the minced garlic and cook for an additional minute until fragrant.
04 - In a large mixing bowl, combine the fresh bread cubes, the sautéed vegetable mixture, chopped parsley, dried sage, dried thyme, ground black pepper, and salt.
05 - Drizzle the remaining melted butter and the chicken broth over the bread mixture. Toss gently until all the components are evenly moistened.
06 - Arrange the seasoned chicken thighs skin-side up on the prepared baking sheet. Generously press a portion of the stuffing mixture onto the top of each chicken thigh, ensuring it adheres firmly to create a crust.
07 - Bake for 30-35 minutes, or until the chicken is fully cooked through (internal temperature reaches 165°F or 74°C) and the stuffing crust is a beautiful golden brown.
08 - For an extra crispy crust, you may broil for 2-3 minutes at the end of the baking time. Allow the chicken thighs to rest for 5 minutes before serving to ensure juiciness.