Add the chicken to a large bowl and pat it down. Add sliced peppers and onions, then pour in Italian dressing and seasonings. Mix well and let it sit for 1 hour or up to overnight.
Place your chicken in a 13x9 baking dish and sprinkle with some all-purpose seasoning. Add 3 tbsps of sliced butter on top of your chicken (if using)
Bake at 375°F uncovered, in the middle rack for 1 hour, or until the chicken is thoroughly cooked and the top is golden brown. Serve hot.
Serving: 1g | Calories: 432kcal