Add rice, breadcrumbs, garlic, and ginger to a food processor. Pulse to combine ingredients. Place mixture in a large bowl.
Add chicken, egg, and teriyaki sauce to bowl. Mix to combine. Let rest in the refrigerator at least 10-15 minutes.
Form mixture into 1 inch meatballs, approximately 1 tablespoon per meatball. Meatballs can be frozen for future use.
Thread meatballs, broccoli, and peppers onto skewers. Chill until ready to cook.
Heat grill to a medium high heat. Grill skewers 3-4 minutes. Flip then cook 2 more minutes until done. Brush with more teriyaki sauce.
Garnish with sesame seeds and scallions. Serve immediately.