In a medium mixing bowl, whisk your oil, vinegar, together with sea salt, pepper, minced garlic, chili flakes and oregano.
Place the chicken breast in a Ziploc bag, or glass bowl and pour in HALF of your olive-garlic mixture. Shake or toss to combine, then allow chicken to marinade for at least 30 minutes, covered in the refrigerator.
Meanwhile prepare your veggies, and place them in a large bowl. Add the remaining garlic oil mixture and toss well to coat.
Heat an outdoor or an stovetop grill to medium-high heat.
Discard all marinade.
Place the veggies on the grill and cook in batches, flipping them constantly until the edges are nicely charred, about 5-6 minutes until they are crisp-tender.
Set on a platter as they are ready.
Grill your chicken about 5 minutes on each side, or until internal temperature reaches 165 degrees F.
Place chicken on your platter next to the veggies, and sprinkle with fresh chopped parsley if desired.
Enjoy!