01 - Pat the chicken thighs dry thoroughly. Season generously with salt, freshly ground black pepper, smoked paprika, and dried thyme on all sides.
02 - Heat olive oil and unsalted butter in a large skillet or Dutch oven over medium-high heat. Arrange the chicken thighs skin-side down and sear until deeply golden, about 6 minutes per side. Transfer chicken to a plate and set aside.
03 - In the same pan, add the sliced onions. Sauté, stirring occasionally, until the onions are tender and caramelized, roughly 8 minutes. Add the minced garlic and cook for 1 additional minute until fragrant.
04 - Sprinkle the flour evenly over the onions. Stir and cook for 1–2 minutes, allowing the flour to absorb fat and removing its raw flavor.
05 - Gradually pour in the chicken broth while continuously whisking to avoid lumps. Bring the mixture to a gentle simmer.
06 - Return the chicken thighs to the skillet, skin-side up. Spoon some onions and gravy over each piece. Cover and simmer over low heat for 25–30 minutes until the chicken is fully cooked and the gravy thickens.
07 - Taste the gravy and adjust salt and pepper as needed.
08 - Serve chicken thighs smothered in the rich onion gravy. Garnish with chopped fresh parsley if desired.