01 - Pat chicken thighs dry and season thoroughly with salt, black pepper, smoked paprika, and dried thyme.
02 - Heat olive oil and unsalted butter in a large skillet or Dutch oven over medium-high heat.
03 - Place 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 softened and golden, about 8 minutes. Add minced garlic and sauté for 1 minute.
05 - Sprinkle flour over onions. Stir and cook for 1 to 2 minutes to remove the raw flour taste.
06 - Gradually pour in chicken broth while whisking continuously to prevent lumps. Bring the mixture to a gentle simmer.
07 - Place the seared chicken thighs back into the skillet, skin-side up. Spoon some of the gravy and onions over the chicken.
08 - Cover and simmer over low heat for 25 to 30 minutes, until the chicken is fully cooked and gravy has thickened.
09 - Taste the gravy and adjust salt and black pepper as needed.
10 - Serve chicken thighs topped with the savory onion gravy. Garnish with chopped fresh parsley if desired.