In a large mixing bowl, thoroughly combine the ground beef (or turkey), breadcrumbs, the egg, finely chopped green onions, soy sauce, garlic powder, ginger powder, along with a pinch of salt and pepper. Use your hands or a spoon to ensure the ingredients are evenly mixed.
Shape the mixture into small meatballs, roughly 1 inch in diameter, and arrange them neatly on a baking tray.
In a separate bowl, whisk together the sweet chili sauce, rice vinegar, and sesame oil until well blended.
Transfer the meatballs into the crockpot, then pour the sweet chili sauce mixture over them, making sure all the meatballs are generously coated in the sauce.
Cover the crockpot with the lid and set it to cook on low for 6-8 hours, or on high for 3-4 hours, until the meatballs are thoroughly cooked and tender to the touch.
After cooking, carefully stir the meatballs in the sauce to ensure they are well-coated before serving them.
Serve the meatballs warm, garnished with a sprinkle of sesame seeds and additional chopped green onions for a burst of color and flavor if desired.
Notes
Serve with steamed rice or noodles for a complete meal.