Sear: Heat olive oil in the large hammered sauté pan over medium-high heat. Season chicken with salt and pepper, then sear for 5–7 minutes per side until golden. Remove and set aside.
Sauté: In the same pan, add the peppers and zucchini. Cook for 3–4 minutes until slightly softened.
Combine: Add the garlic, tomatoes, olives, and lemon slices. Stir for 1 minute until fragrant.
Simmer: Place the chicken back into the pan, nestling it among the vegetables. Cover with the lid and simmer on medium-low for 8–10 minutes until the chicken is cooked through.
Finish: Garnish with fresh parsley and a squeeze of extra lemon juice.