Creating the Italian Chicken Sheet Pan Supper is straightforward when following these steps:

1. Preheat your oven to 425°F (220°C) and line a large baking sheet with parchment paper.
2. In a large bowl, combine the cherry tomatoes, bell peppers, zucchini, red onion, and garlic.
3. Drizzle 2 tablespoons of olive oil over the vegetables, then sprinkle with salt, pepper, and Italian seasoning. Toss to coat evenly.
4. Place the chicken thighs on the prepared baking sheet, skin-side up.
5. Drizzle the remaining 1 tablespoon of olive oil over the chicken and season with salt and pepper.
6. Arrange the vegetable mixture around the chicken on the sheet pan.
7. Bake in the preheated oven for 45-60 minutes, or until the chicken reaches an internal temperature of 165°F (75°C) and the vegetables are tender.
8. Remove from the oven and let it rest for 5-10 minutes.
9. Garnish with fresh basil if desired and serve with lemon wedges.

These steps will guide you to a perfectly cooked Italian Chicken Sheet Pan Supper that everyone will love!