Preheat your oven to 400°F (200°C).
Season the chicken breast with half of the sea salt, black pepper, and herbes de Provence.
Place the chicken on a parchment-lined baking sheet and roast for 20-25 minutes until the internal temperature reaches 165°F.
While the chicken roasts, dice the eggplant, zucchini, and red bell pepper into uniform half-inch cubes.
Heat the olive oil in a large skillet over medium heat. Add the eggplant and sauté for 5 minutes until it begins to soften.
Add the zucchini and bell pepper to the skillet, cooking for another 5-7 minutes until the vegetables are tender-crisp.
Stir in the minced garlic and remaining spices, cooking for 1 minute until fragrant.
Pour in the tomato puree and reduce heat to low, simmering the vegetable mixture for 10 minutes to allow the flavors to meld.
Slice the roasted chicken breast into strips.
Plate the ratatouille in a shallow bowl and top with the sliced chicken breast.