In a small bowl, whisk together the extra virgin olive oil, lemon juice, lemon zest, minced garlic, dried oregano, sea salt, and black pepper to create the marinade.
Place the chicken breast in a shallow dish, pour half of the marinade over it, and let it marinate for at least 20 minutes to infuse the meat with bright citrus notes.
Preheat your grill or a heavy grill pan over medium-high heat and lightly brush the surface with a tiny bit of oil if needed.
Toss the asparagus spears and zucchini slices in the remaining marinade until they are evenly coated.
Grill the chicken breast for approximately 6 minutes per side, or until the internal temperature reaches 165 degrees Fahrenheit.
Add the vegetables to the grill during the last 5 minutes of cooking, turning occasionally until they are tender and show beautiful smoky char marks.
Remove everything from the heat and serve the chicken and vegetables over a bed of warm, fluffy quinoa.