Preheat your oven to 425°F and arrange the oven rack in the middle position. Pat the chicken thighs completely dry with paper towels—moisture prevents crispy skin from forming properly.
In a small bowl, combine salt, pepper, garlic powder, paprika, and thyme. Rub this savory mixture all over both sides of the chicken, making sure every surface gets coated evenly for maximum flavor development.
Heat olive oil in a large oven-safe skillet over medium-high heat until shimmering. Working in batches if needed, sear the hearty savory baked chicken thighs recipe for 3-4 minutes per side until golden brown, then transfer to a plate temporarily.
In the same skillet, sauté diced onion for 2 minutes until softened, then add minced garlic and cook for 30 seconds until fragrant. Stir in tomato paste and cook for 1 minute, allowing it to caramelize slightly.
Pour in chicken broth while scraping up any browned bits stuck to the pan bottom with a wooden spoon. Add carrots, celery, bay leaf, and rosemary, then nestle the seared chicken back into the liquid skin-side up.
Transfer the skillet to the preheated oven and bake uncovered for 20-25 minutes until the internal temperature reaches 165°F at the thickest part of the thigh.
Remove from the oven and let rest for 3-5 minutes before serving. The carryover cooking continues while the meat relaxes, ensuring maximum juiciness in every bite.