1. Prepare the Vegetables: Wash and dice the eggplant, zucchini, red bell pepper, yellow bell pepper, and tomatoes. Slice the red onion and mince the garlic. Consistent size helps even cooking.

2. Season the Vegetables: In a mixing bowl, combine the diced vegetables with 2 tablespoons of olive oil, 1 teaspoon each of dried thyme, basil, and oregano. Add salt and pepper to taste. Toss everything well to coat the vegetables evenly.

3. Preheat the Air Fryer: Set your air fryer to 375°F (190°C) and let it preheat for about 3 minutes. This ensures even cooking from the start.

4. Arrange Vegetables in the Basket: Place the seasoned vegetables in the air fryer basket. Avoid overcrowding; cook in batches if necessary for even cooking.

5. Cook the Ratatouille: Cook for 15-20 minutes, shaking the basket halfway through to ensure even cooking. Check for tenderness and adjust the time as needed.

6. Serve and Garnish: Once cooked, transfer the ratatouille to a serving dish. Garnish with fresh basil leaves if desired. Serve hot and enjoy!