Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Dice the chicken breast, eggplant, zucchini, red bell pepper, and onion into uniform 1-inch pieces.
Place the chopped vegetables and chicken on the baking sheet, then drizzle with olive oil and sprinkle with sea salt, black pepper, and dried oregano.
Toss everything thoroughly to ensure an even coating of oil and spices, then spread into a single layer.
Roast for 20-25 minutes, or until the chicken is cooked through and the vegetables are tender and slightly caramelized.
While roasting, warm the tomato puree and minced garlic in a small saucepan over low heat for 5 minutes.
Transfer the roasted chicken and vegetables into a large bowl, pour the warm tomato sauce over them, and gently fold to combine.
Garnish with fresh torn basil before serving.