Preheat your oven to 400°F and line a large rimmed sheet pan with parchment paper for easy cleanup.
Pat the chicken breast dry with paper towels to ensure proper browning and cut into uniform 1-inch bite-sized pieces.
Trim the tough, woody ends off the asparagus stalks and slice the zucchini into 1/2-inch thick half-moon shapes.
In a small glass bowl, whisk together the extra virgin olive oil, lemon juice, lemon zest, minced garlic, dried oregano, sea salt, and black pepper.
Place the chicken pieces, asparagus, and zucchini onto the prepared sheet pan and pour the lemon-herb marinade over the top.
Toss the ingredients thoroughly with your hands or tongs until every piece is well coated, then spread them out into a single, even layer.
Roast in the center of the oven for 18 to 22 minutes, or until the chicken is cooked through and the vegetables are tender with slightly charred, golden edges.