Start by preheating your oven to 400°F (200°C) to create a warm environment for roasting.
In a large mixing bowl, combine 2 tablespoons of olive oil with the ranch seasoning mix. Whisk them together until you have a smooth marinade.
Add the chicken breasts to the bowl, ensuring each piece is generously coated in the ranch marinade. Allow the chicken to marinate for 10-15 minutes at room temperature, letting the flavors infuse.
While the chicken is marinating, prepare the vegetables. On a spacious baking sheet, spread out the halved baby potatoes, sliced bell peppers, zucchini, and onion wedges in a single, even layer.
Drizzle a little more olive oil over the vegetables and sprinkle with salt and black pepper. Toss everything together with your hands or a spatula until all vegetables are lightly coated.
Nestle the marinated chicken breasts into the arrangement of vegetables on the baking sheet, making sure they’re not overcrowded for even cooking.
Transfer the baking sheet to the preheated oven. Bake for 25-30 minutes, or until the chicken is no longer pink in the center and reaches an internal temperature of 165°F (75°C), and the vegetables are tender and slightly caramelized.
Once cooked, carefully remove the baking sheet from the oven. Allow the dish to rest for 5 minutes to lock in the juices before serving.
Before serving, sprinkle freshly chopped parsley over the dish for a burst of color and freshness.
Notes
Serve directly from the baking sheet for a rustic feel or plate individually for a polished presentation.