In a medium bowl, whisk together the extra virgin olive oil, coconut aminos, fresh lemon juice, garlic powder, dried oregano, sea salt, and black pepper to create the marinade.
Add the cubed chicken breast and top sirloin beef to the bowl, tossing until every piece is thoroughly coated, then let it marinate for at least 15 minutes.
While the meat marinates, chop the bell peppers and red onion into large, uniform chunks suitable for skewering.
Thread the marinated chicken, beef, peppers, and onions onto skewers, alternating the ingredients to ensure even cooking and flavor distribution.
Preheat a grill or grill pan over medium-high heat and lightly grease the surface to prevent sticking.
Grill the skewers for 10 to 12 minutes, turning them every few minutes, until the meat is cooked through and the vegetables have developed a beautiful char.
Remove the skewers from the heat and allow them to rest for 3 minutes to lock in the juices before serving.