Preheat your oven to 375°F (190°C).
Pat the chicken thighs dry using paper towels. Season both sides generously with salt, chili powder, onion powder, garlic powder, and Italian herb seasoning.
Heat a large oven-safe skillet over medium heat. Add olive oil, 1 tablespoon butter, and 2 tablespoons honey.
Place the chicken thighs skin-side down and sear for about 3 minutes per side until golden and crisp.
Move the chicken slightly to create space in the center of the pan. Add the remaining butter, remaining honey, and Dijon mustard. Stir until melted and combined.
Add the sweet potato chunks and red onion pieces to the skillet. Season lightly with chili powder and Italian seasoning, then toss to coat in the honey mixture.
Transfer the skillet carefully to the oven and roast the One Pan Honey Chicken and Sweet Potatoes for 15–20 minutes, or until the chicken is fully cooked and the sweet potatoes are tender.
Garnish with fresh thyme before serving.