Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Dice the chicken breast, zucchini, eggplant, and red bell pepper into uniform 1-inch cubes.
Place the chicken and vegetables on the baking sheet, drizzle with olive oil, and sprinkle with sea salt, black pepper, and dried oregano.
Toss everything together until evenly coated, then spread into a single layer and roast for 20-25 minutes until the chicken is cooked through and the vegetables are tender.
While the vegetables roast, combine the tomato puree, minced garlic, and coconut milk in a small saucepan over medium-low heat.
Whisk the sauce gently until it begins to simmer and thickens slightly, about 5 minutes.
Transfer the roasted chicken and vegetables into a large bowl, pour the creamy tomato sauce over the top, and toss gently to combine before serving.