Preheat the oven to 425 degrees. Prepare a large rimmed baking sheet with parchment paper.
In a bowl, mix together the chicken, 1 tablespoon olive oil, 1 teaspoon Italian seasoning, 1 teaspoon minced garlic, salt, and black pepper. Set aside.
In a large bowl, toss together the eggplant, squash, zucchini, red bell pepper, onion, and tomatoes. Add the remaining olive oil, garlic, and seasonings. Toss again to distribute evenly.
Transfer the vegetables to the prepared baking sheet. Over the vegetables, drop the chicken.
Bake for 20 to 25 minutes or until the chicken is cooked through and the vegetables have reached your desired tenderness.
Prior to serving, top the chicken and vegetables with the snipped basil.