Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Cut the eggplant, zucchini, and red bell pepper into uniform 1-inch cubes.
Toss the cubed vegetables with 0.5 tablespoons of the olive oil, sea salt, and black pepper on the baking sheet.
Roast the vegetables for 20 minutes until they are tender and slightly caramelized at the edges.
While the vegetables roast, dice the chicken breast into bite-sized pieces and season with the Herbes de Provence.
Heat the remaining 0.5 tablespoons of olive oil in a large skillet over medium-high heat.
Add the chicken to the skillet and sauté until golden brown and cooked through, then remove and set aside.
In the same skillet, add the diced onion and minced garlic, sautéing until the onion is translucent and fragrant.
Pour in the crushed tomatoes and stir in the roasted vegetables and cooked chicken.
Simmer the mixture for 5 minutes to meld the flavors, then garnish with chopped fresh basil before serving.