Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper.
Cut the chicken breast into 1-inch bite-sized cubes and place them in a large mixing bowl.
Slice the zucchini into half-moons, chop the bell pepper into 1-inch pieces, and break the broccoli into small florets.
Add all the vegetables to the bowl with the chicken and drizzle with the extra virgin olive oil.
Sprinkle the garlic powder, dried oregano, sea salt, and black pepper over the mixture and toss thoroughly to coat.
Spread the chicken and vegetables in a single layer on the prepared baking sheet, ensuring they are not overcrowded to allow for proper browning.
Roast in the oven for 18 to 22 minutes, or until the chicken is cooked through and the vegetables are tender with slightly charred edges.
Remove from the oven and serve immediately, topped with fresh avocado slices for a rich and creamy finish.