In a bowl, whisk together the coconut aminos, rice vinegar, chili garlic sauce, honey, sesame oil, and garlic to make the marinade.
Slice the steak into thin strips and place it in a bowl or zip-lock bag. Pour the marinade over the steak, toss to coat, and refrigerate for at least 1 hour. The longer it marinates, the more flavorful it will be.
Heat the oil in a large skillet over medium-high heat. Add the green beans, bell peppers, and onion, then stir to coat. Cover and cook for about 10 minutes, stirring every few minutes. Remove the lid during the last few minutes of cooking to allow any excess moisture to evaporate. Season with garlic powder, onion powder, salt, and pepper.
Heat a separate skillet over high heat. Remove the steak from the marinade, letting the excess drip off, and add it to the hot pan. Cook for about 2 minutes per side, or until it reaches your desired doneness.
Divide the cooked vegetables and steak between serving bowls. Garnish with sesame seeds and sliced green onions, then serve immediately.