Preheat your oven to 400°F (200°C).
On a large baking sheet, toss the cubed eggplant, sliced zucchini, and chopped bell peppers with 0.5 tbsp of olive oil, 0.125 tsp sea salt, and 0.125 tsp black pepper.
Roast the vegetables for 20-25 minutes, tossing halfway through, until they are tender and slightly caramelized.
While vegetables roast, season the chicken breast with the remaining sea salt and black pepper.
Heat the remaining 0.5 tbsp of olive oil in a skillet over medium-high heat and cook the chicken for 6-7 minutes per side until the internal temperature reaches 165°F.
Remove the chicken from the pan, let it rest for 5 minutes, then slice into strips.
In the same skillet, add the minced garlic and cook for 1 minute until fragrant.
Pour in the tomato puree, dried oregano, and lemon zest, simmering for 3-5 minutes to allow the flavors to meld.
Gently fold the roasted vegetables and sliced chicken into the sauce and serve immediately.