In a large bowl, mix together all meatball ingredients until just combined—don’t over mix.
Form into 20 meatballs.
Heat a non-stick pan over medium heat. Add meatballs and cook for 12–15 minutes, turning occasionally. The sugar content in the maple syrup makes the meatballs more susceptible to burning, so keep a close eye on things.
Remove meatballs and set aside.
In the same pan, add sauce ingredients (except cornstarch slurry). Bring to a simmer.
Stir in the cornstarch slurry and cook until thickened.
Add meatballs back to the pan, toss to coat, and cook for 1–2 more minutes.
Serve with sticky rice, sesame seeds, and green onions.