My favorite vegetables to use in this stuffed chicken recipe are zucchini, squash, bell peppers, onions, tomatoes, and mushrooms. These are my go-to veggies for making this chicken because I always have them on hand. If you have other vegetables on hand or prefer certain flavors, you can easily swap them. In particular, this would be great with sliced eggplant, yellow squash, mushrooms, or even asparagus.