Oven & Vinaigrette Prep : Arrange an oven rack in the upper-third position and preheat to 400°F (205°C). In a small bowl, whisk together the olive oil, low-sodium chicken broth, lemon juice, minced garlic, dried oregano, dried dill, black pepper, and sea salt. Set the vinaigrette aside.
Sear the Chicken : Pat the chicken thighs completely dry with paper towels. Heat your oven-safe skillet over medium-high heat. Place the chicken in the hot, dry skillet and sear until golden-brown on the first side, about 3 to 4 minutes. Flip and sear the other side for another 3 minutes. Transfer the seared chicken to a plate.
Build the Vegetable Base : Reduce the heat to medium and add the onion and bell pepper strips to the skillet, using the rendered chicken fat. Sauté for 5 to 7 minutes, until they begin to soften.
Combine for Roasting : Turn off the heat. Stir the zucchini, tomato wedges, rinsed olives, and rinsed artichoke hearts into the skillet with the onions and peppers. Return the seared chicken to the skillet, placing it amongst the vegetables. Pour the prepared vinaigrette evenly over the entire dish.
Oven Roast : Carefully transfer the skillet to the preheated oven. Roast for 20 to 25 minutes, or until the vegetables are tender and an instant-read thermometer inserted into the thickest part of the chicken registers 165°F (74°C).
Final Touches & Serving : Remove the skillet from the oven and set your oven to broil on high. Crumble the feta cheese over the chicken and vegetables. Return the skillet to the upper rack, about 6 to 8 inches from the heating element. Broil for 2 to 4 minutes, until the feta is softened and just beginning to brown at the edges. Let the dish rest for 5 minutes before serving. Spoon the pan juices over each portion and garnish generously with fresh dill.