Creating Epic Teriyaki Chicken Skewers is a breeze if you follow these straightforward steps:

1. Prepare Marinade: In a bowl, combine soy sauce, brown sugar, rice vinegar, sesame oil, minced garlic, and grated ginger. Stir well until the sugar dissolves. If you prefer thicker sauce, mix in cornstarch.

2. Marinate Chicken: Place the chicken cubes in a large zip-top bag or a shallow dish. Pour the marinade over the chicken, ensuring all pieces are coated. Seal or cover and marinate in the fridge for at least 30 minutes.

3. Preheat Grill: Preheat your grill to medium-high heat. If using wooden skewers, soak them in water for about 30 minutes to prevent burning.

4. Skewer Chicken and Vegetables: Thread marinated chicken, bell pepper squares, and onion chunks onto the skewers, alternating as you go.

5. Season the Skewers: Lightly season with salt and pepper for added flavor.

6. Grill Skewers: Place skewers on the grill and cook for about 15-20 minutes, flipping occasionally until the chicken is cooked through, and juices run clear.

7. Baste with Marinade: For extra flavor, baste the skewers with reserved marinade during the last few minutes of grilling.

8. Check for Doneness: Ensure the chicken reaches an internal temperature of 165°F (75°C).

9. Remove from Grill: Once cooked, remove the skewers from the grill and let them rest for a few minutes.

10. Garnish: Sprinkle with sesame seeds and chopped green onions before serving for an added touch of flavor and presentation.