01 - Pat chicken thighs dry and evenly season with salt, black pepper, smoked paprika, and dried thyme.
02 - Heat olive oil and butter in a large skillet or Dutch oven over medium-high heat. Sear chicken thighs skin-side down until golden brown, approximately 6 minutes per side. Remove chicken and set aside.
03 - In the same pan over medium heat, add sliced onions. Cook, stirring occasionally, until softened and deeply golden, about 8 minutes. Stir in the minced garlic and cook for 1 minute.
04 - Sprinkle flour over the onions. Stir well and cook for 1 to 2 minutes until flour is lightly toasted and no raw smell remains.
05 - Gradually pour in the chicken broth, whisking continuously to prevent lumps from forming. Bring the mixture to a gentle simmer.
06 - Nestle the seared chicken thighs back into the skillet, placing them skin-side up. Spoon some of the onion gravy over each piece.
07 - Cover and simmer on low heat for 25 to 30 minutes, until the chicken is fully cooked and the gravy is thickened.
08 - Taste the gravy and adjust seasoning as needed. Serve chicken topped with generous spoonfuls of onion-rich gravy, and garnish with chopped fresh parsley if desired.