01 - Preheat oven to 425°F.
02 - Pat chicken breasts dry with paper towels. Season both sides generously with salt, black pepper, smoked paprika, and dried oregano.
03 - Heat 1 tablespoon olive oil in a large oven-safe skillet over medium-high heat. Sear chicken breasts for 2–3 minutes per side until a golden crust forms, then transfer to a plate and set aside.
04 - Add the remaining tablespoon of olive oil to the skillet along with the sliced bell peppers, red onion, and minced garlic. Sauté for 4–5 minutes until the vegetables are softened and fragrant.
05 - Return the seared chicken breasts to the skillet, nestling them among the sautéed vegetables. Sprinkle with crushed red pepper flakes if desired.
06 - Transfer the skillet to the preheated oven and roast for 15–18 minutes, or until the chicken is cooked through (internal temperature reaches 165°F) and the peppers are tender.
07 - Remove the skillet from the oven. Garnish with freshly chopped parsley and serve immediately while hot.