Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Dice the eggplant, zucchini, and red bell pepper into bite-sized pieces and place them on the baking sheet.
Drizzle the vegetables with 0.5 tbsp of olive oil and sprinkle with the sea salt, tossing to coat evenly.
Roast the vegetables for 20-25 minutes until they are tender and show slight caramelized edges.
While the vegetables roast, cut the chicken breast into 1-inch cubes.
Heat the remaining 0.5 tbsp of olive oil in a large skillet over medium-high heat and sauté the chicken for 6-8 minutes until golden and cooked through.
Add the minced garlic and dried oregano to the skillet, stirring for 1 minute until fragrant.
Stir in the tomato puree and the roasted vegetables, allowing the mixture to simmer for 3-5 minutes to meld the flavors.
Remove from heat and stir in the lemon zest and black pepper.
Garnish with freshly chopped basil and serve warm.