In a mixing bowl, combine 2 tablespoons of avocado oil, 3 tablespoons of liquid aminos or soy sauce, 1 teaspoon of garlic powder, and 1 teaspoon of onion powder. Whisk until well combined.
Add the chopped NY strip steak into the bowl with the marinade. Toss to coat all the pieces evenly. Cover and let it marinate in the refrigerator for at least 30 minutes, or up to 2 hours for maximum flavor.
While the steak marinates, chop the red, green, and orange bell peppers into 2-inch pieces, and slice the red onion into wedges. Set aside.
If using a grill, preheat it to medium-high heat. If using an oven, preheat it to 400°F (200°C).
Once the steak has marinated, thread the steak chunks and chopped vegetables onto the skewers, alternating between steak and veggies for a colorful presentation.
In a small bowl, mix 2 tablespoons of avocado oil with 1 tablespoon of liquid aminos or soy sauce. Brush the kabobs with this mixture to add extra flavor and prevent sticking.
If grilling, place the skewers directly on the grill grates. Grill for about 10-12 minutes, turning occasionally until the steak is cooked to your liking. If using the oven, place the skewers on a baking sheet and roast for about 15-20 minutes, turning halfway through.
Once cooked, remove the kabobs from the heat and let them rest for 5 minutes. This helps the juices redistribute. Serve hot, either on the skewer or removed onto a platter.