Preheat your oven to 400°F (200°C). In a large bowl, combine the chicken cubes with 1 tablespoon of olive oil, oregano, thyme, salt, and pepper. Mix well to coat the chicken evenly.

Arrange the seasoned chicken in a single layer in the center of a large baking sheet, leaving space around the edges for the vegetables. Avoid overcrowding the pan; use two baking sheets if necessary.

In the same bowl, toss the zucchini, cherry tomatoes, red onion, and garlic with the remaining 2 tablespoons of olive oil and lemon juice until well combined.

Arrange the vegetables around the chicken on the baking sheet, spreading them evenly for consistent roasting.

Bake for 25-30 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender.

Remove from the oven and immediately sprinkle with Kalamata olives, crumbled feta cheese, and fresh parsley while still hot. Serve warm with your choice of sides.