Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Dice the eggplant, zucchini, and red bell pepper into uniform 1-inch cubes for even cooking.
Toss the cubed vegetables on the baking sheet with 1 teaspoon of olive oil, dried thyme, dried oregano, sea salt, and black pepper.
Roast the vegetables for 20 to 25 minutes until they are tender and slightly caramelized at the edges.
While the vegetables roast, season the chicken breast and pan-sear it in a skillet with the remaining 1 teaspoon of olive oil over medium heat for 6-7 minutes per side.
In a separate small saucepan, sauté the diced onion and minced garlic until translucent, then stir in the crushed tomatoes and simmer on low.
Gently fold the roasted vegetables into the tomato sauce and let the flavors meld for 5 minutes.
Slice the cooked chicken breast and serve it over the warm vegetable ratatouille, garnished with hand-torn fresh basil.