Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Chop the zucchini, eggplant, and red bell pepper into uniform 1-inch cubes.
Slice the chicken breast into bite-sized pieces, approximately the same size as the vegetables for even cooking.
In a large mixing bowl, combine the chicken, zucchini, eggplant, and bell pepper.
Drizzle with extra virgin olive oil and sprinkle with dried oregano, garlic powder, sea salt, and black pepper.
Toss everything thoroughly to ensure the chicken and vegetables are evenly coated in oil and spices.
Spread the mixture onto the prepared baking sheet in a single layer, ensuring they are not overcrowded to allow for proper roasting.
Roast in the oven for 20 minutes, or until the chicken is cooked through and the vegetables are starting to brown.
Remove the tray from the oven, pour the tomato puree over the mixture, and stir gently to combine.
Return to the oven for an additional 5 minutes to allow the sauce to thicken and flavors to meld.
Remove from the oven and garnish with freshly chopped basil and lemon zest for a bright, aromatic finish.