Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Cut the chicken breast into 1-inch bite-sized cubes and chop the broccoli, bell pepper, and zucchini into similar uniform sizes to ensure even cooking.
In a small mixing bowl, whisk together the extra virgin olive oil, fresh lemon juice, minced garlic, dried oregano, sea salt, and black pepper.
Place the chicken cubes and chopped vegetables onto the prepared sheet pan.
Pour the lemon-herb dressing over the chicken and vegetables, tossing thoroughly with your hands or tongs to ensure every piece is well-coated.
Spread the mixture out into a single layer, making sure the chicken pieces are not crowded or overlapping.
Roast in the oven for 18 to 22 minutes, or until the chicken is cooked through and the vegetables are tender and slightly caramelized.
Remove from the oven and let cool slightly before dividing into meal prep containers for a healthy, high-protein lunch.