Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Dice the chicken breast, zucchini, eggplant, red bell pepper, and onion into uniform half-inch cubes.
In a large mixing bowl, combine the diced chicken and vegetables with olive oil, herbes de Provence, minced garlic, sea salt, and black pepper.
Toss everything thoroughly until the chicken and vegetables are evenly coated in the oil and spices.
Spread the mixture in a single layer onto the prepared baking sheet, ensuring enough space for the vegetables to roast rather than steam.
Roast in the oven for 20 minutes, stirring halfway through to ensure even browning.
Remove the sheet from the oven, pour the tomato puree over the mixture, and stir gently to combine.
Return to the oven for another 5 to 7 minutes until the sauce is bubbling and the chicken is fully cooked.
Remove from the oven and garnish with freshly torn basil leaves before serving warm.