01 - Pat chicken thighs dry with paper towels, then season thoroughly with salt, black pepper, smoked paprika, and dried thyme on all sides.
02 - Warm olive oil and unsalted butter over medium-high heat in a large skillet or Dutch oven.
03 - Place the chicken thighs skin-side down and sear until golden brown, approximately 6 minutes per side. Remove chicken and set aside.
04 - In the same skillet, add sliced onions and cook, stirring occasionally, until soft and golden, about 8 minutes. Add minced garlic and cook for 1 minute, stirring constantly.
05 - Sprinkle flour evenly over onions, stir to coat, and cook for 1–2 minutes to eliminate any raw flour flavor.
06 - Gradually add chicken broth, whisking continuously to prevent lumps, and bring to a gentle simmer.
07 - Return seared chicken thighs to the pan, skin-side up, and gently spoon the onion gravy over the chicken pieces.
08 - Cover and cook on low heat for 25–30 minutes, until the chicken reaches an internal temperature of 165°F and the gravy is thickened.
09 - Sample the sauce and adjust seasoning with salt and black pepper as needed.
10 - Serve hot chicken smothered with onion gravy, garnished with chopped fresh parsley if desired.