Slice the chicken breast into thin bite-sized strips and season with a pinch of salt and pepper.
Heat half of the olive oil in a large skillet over medium-high heat and sear the chicken until golden and cooked through, then remove from the pan and set aside.
Add the remaining olive oil to the same skillet and sauté the diced onion and minced garlic until translucent and aromatic.
Incorporate the cubed eggplant, sliced zucchini, and chopped red bell pepper into the skillet, cooking for 5-7 minutes until the vegetables begin to soften.
Stir in the tomato puree, herbes de Provence, sea salt, and black pepper, then reduce the heat to low.
Cover the skillet and simmer for 10 minutes to allow the flavors to meld and the vegetables to become tender.
Return the cooked chicken to the pan, tossing gently to coat in the herb sauce and heat through.
Garnish with freshly torn basil leaves before serving warm.