In a large mixing bowl, soak the chicken thighs in buttermilk for at least 1 hour. For optimal tenderness, refrigerate and marinate overnight.
In a shallow dish, whisk together the flour, garlic powder, onion powder, smoked paprika, salt, and black pepper until well mixed.
Carefully remove the chicken from the buttermilk, allowing any excess to drip off. Coat each thigh in the seasoned flour mixture, ensuring an even layer.
Heat the olive oil and butter in a large skillet over medium-high heat. Once hot, place the chicken thighs in the skillet, skin-side down. Cook for about 5-7 minutes, or until the skin is golden and crispy. Flip and cook the other side for an additional 5-7 minutes. Transfer the chicken to a plate and set aside.
In the same skillet, add the sliced onion and bell pepper. Sauté for approximately 5 minutes until they soften. Add the minced garlic and sauté for another minute until fragrant.
Pour in the chicken broth and Worcestershire sauce, stirring to combine. Scrape any flavorful brown bits from the bottom of the skillet.
Return the chicken thighs to the skillet, ensuring they are placed skin-side up. Lower the heat to a gentle simmer, cover, and let the dish simmer for about 30 minutes.
After 30 minutes, carefully remove the chicken from the skillet and let it rest for a few minutes. Increase the heat to medium-high to reduce the sauce slightly for about 5 minutes if desired.
Plate the chicken on a bed of rice or mashed potatoes, then ladle the sauce over the top. Garnish with chopped fresh parsley.
Notes
Serve on a rustic wooden board or elegant white plate, pairing it with a side of greens for color contrast.