Follow these easy steps to create your Pesto Chicken with Roasted Veggies:

1. Preheat the Oven: Preheat your oven to 425°F (220°C).
2. Marinate the Chicken: In a bowl, combine chicken breasts and basil pesto. Make sure each piece is well-coated. Allow it to marinate for at least 15 minutes.
3. Prepare the Veggies: On a large baking sheet, toss cherry tomatoes, red bell pepper, zucchini, yellow squash, and red onion with olive oil, salt, and pepper until evenly coated.
4. Arrange on Baking Sheet: Spread the seasoned vegetables on one side of the baking sheet in a single layer.
5. Add the Chicken: Place the marinated chicken breasts on the other side of the baking sheet.
6. Roast: Bake in the preheated oven for 25-30 minutes, or until the chicken is cooked through and the vegetables are tender.
7. Check for Doneness: Use a meat thermometer to ensure the chicken reaches an internal temperature of 165°F (75°C).
8. Garnish and Serve: Once cooked, remove from the oven and let it rest for 5 minutes. Garnish with fresh basil leaves if desired.

These straightforward steps will guide you through creating a dish that is as delicious as it is satisfying!