Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper for easy cleanup.
Dice the eggplant, zucchini, red bell pepper, and yellow onion into uniform 1-inch cubes to ensure even roasting.
In a large mixing bowl, toss the diced vegetables with the extra virgin olive oil, minced garlic, dried thyme, sea salt, and black pepper.
Spread the seasoned vegetables in a single layer on the prepared baking sheet and roast for 20 minutes.
While the vegetables are roasting, season the chicken breast with a small amount of the salt and pepper, then roast on a separate tray for 18-22 minutes until the internal temperature reaches 165°F.
Remove the vegetables from the oven, stir in the tomato puree, and return to the oven for an additional 10 minutes until the sauce is thick and fragrant.
Slice the cooked chicken breast into thin strips across the grain for maximum tenderness.
Portion the roasted ratatouille into bowls, top with the sliced chicken, and garnish with hand-torn fresh basil before serving.