01 - Preheat oven to 425°F. Position rack in the center of the oven.
02 - Pat chicken breasts dry with paper towels. Season both sides generously with salt, black pepper, smoked paprika, and dried oregano, pressing the spices into the meat.
03 - Heat 1 tablespoon of 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. Transfer to a plate and set aside.
04 - Add the remaining tablespoon of olive oil to the same skillet. Toss in the sliced bell peppers, red onion, and minced garlic. Sauté for 4-5 minutes until the vegetables begin to soften and pick up color.
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. Roast for 15-18 minutes until the chicken is cooked through (internal temperature reaches 165°F) and the peppers are tender.
07 - Remove from the oven and let rest for 2-3 minutes. Garnish with freshly chopped parsley and serve immediately while hot.