3 oz. chicken breast, 1 small zucchini, 1⁄8 red bell pepper, 1⁄8 yellow bell pepper, 1⁄4 red onion, 1 tbsp. butter, 1 tbsp. soy sauce, 2 tsp. rice vinegar, 2 tsp. sesame oil, 1 tsp. black sesame seeds, 1 tbsp. scallions, salt, and pepper