Chop the chicken into 1.5 to 2-inch chunks and place in a sealable container or a zip lock bag.: The smell of fresh chicken is neutral and slightly metallic at first, but when you cut it into uniform pieces you immediately create a rhythm that makes the rest of prep easier. Evenly sized cubes ensure the chicken will cook at the same rate, avoiding chewy edges or raw centers. Use a clean cutting board and a sharp knife so the cuts are smooth, not ragged which helps the marinade cling better. A common error here is inconsistent sizing, which leads to uneven doneness, so take a moment to match pieces by eye.
Stir together the ingredients for the marinade in a bowl or measuring cup and pour into the container with the chicken.: When you mix the avocado oil , liquid aminos, minced garlic , dried oregano , paprika, and sea salt, you should smell a bright, savory aroma with a mild herbal note. Pouring this mixture over the chicken immediately starts to coat each piece, the oil carrying flavors into the meat. The why here is that the oil distributes heat and the aminos add depth, improving browning on the grill. Avoid overdoing the salt if your aminos are salty, as that can make the meat taste too salty after grilling.
Seal it up and move it around so that all of the chicken is well-coated in marinade. Refrigerate at least 1 hour, up to 12.: You will notice the marinade cling better after a few turns, and the chicken should start to look glossier, signaling absorption. Refrigeration lets the flavors penetrate while keeping the meat safe. I prefer at least one hour to let the aromatics mellow and do their work, but up to 12 hours is fine for deeper flavor. A common mistake is marinating too long with a highly acidic mix, but this recipe is balanced so extended time softens rather than mushes the meat.
When you’re ready to grill, chop the vegetables and place them in a mixing bowl. Drizzle with avocado oil and sprinkle with sea salt. Toss the vegetables using your hands until everything is well-coated in oil and sea salt.: The touch of your hands warms the vegetables slightly and helps the oil and salt adhere, so you should feel a light, slick coating on the zucchini , red bell pepper , and red onion . As you toss, you may smell the vegetal sweetness of the pepper rising, and the onions will start to release a faint scent. This step primes the vegetables for even browning and protects them from sticking to the grill. Avoid over-oiling which can cause flare ups and greasy spots on the grill.
Preheat the grill to high – 450 to 500 degrees F.: A properly preheated grill gives you immediate searing energy. You should feel radiant heat and see the grates glow slightly, and when you place a drop of water it should sizzle and evaporate on contact. This high heat creates those desirable grill marks and seals juices in the chicken . If the grill is not hot enough, the meat will dry as it cooks slowly, while too hot and the exterior may burn before the center cooks, so aim for that 450 to 500 degrees F range.
Thread the marinated chicken and vegetables onto skewers (I use metal skewers) and place the skewers on a plate until your grill is preheated.: As you assemble the skewers alternate pieces of chicken and vegetables so each bite is balanced. Metal skewers conduct heat, which helps the interior cook, and the skewers should feel sturdy in your hand. Lay them on a plate and keep them chilled until the grill is ready to prevent premature warming. A common misstep is packing pieces too tightly, which prevents even browning and airflow between items.
Place the chicken kabobs on the preheated grill and replace the cover. Cook 2 minutes, or until grill marks appear. Flip and cook another 2 to 3 minutes covered. Continue grilling and flipping (keeping the grill covered between flips) until chicken is cooked through, turns golden-brown, and everything has a nice char, about 10 to 15 minutes total.: When the skewers hit the grates you will hear an immediate sizzle and begin to smell that toasted, savory aroma. After about 2 minutes you should see crisp grill marks; these visual cues tell you the Maillard reaction is happening, which creates the deep flavor. Flipping helps promote even color while the covered grill traps heat for internal cooking. Listen for steady sizzling rather than aggressive popping, a sign of too much fat or flare ups. Use a thermometer if uncertain, aiming for an internal temperature that results in juicy, safe-to-eat chicken . Avoid constant flipping which interrupts browning and can prevent a good crust from forming.
Remove the chicken from the grill and place on a clean plate. Allow kabobs to cool enough to handle, then serve with choice of side dishes.: As you lift the skewers off the heat, the aroma will deepen and you will see the vegetables glisten with charred edges. Letting them rest briefly allows juices to redistribute in the chicken , keeping it moist as you serve. Present the kabobs on a warm platter and slice or pull pieces as needed for presentation. A common error is serving immediately off the grill when the meat is too hot and juices run out, so a short rest improves both texture and flavor.