Season the chicken with salt, pepper, garlic powder, paprika, and thyme. Heat olive oil in a large skillet over medium heat. Add chicken and sear on all sides until golden brown, about 6–8 minutes. Remove and set aside.
In the same skillet, add a bit more olive oil if needed. Add the onion and cook until soft, about 3 minutes. Stir in the garlic, carrots, bell pepper, and zucchini. Cook for 5–6 minutes until veggies begin to soften.
Return the chicken to the skillet along with the cherry tomatoes. Pour in the chicken broth and bring to a gentle simmer. Cover and cook for 10–12 minutes, or until the chicken is cooked through and the vegetables are tender.
Remove from heat. Garnish with fresh parsley and a squeeze of lemon if desired. Serve warm with rice, grains, or bread.