Add all the ingredients to a large bowl aside from the oil and 1 tablespoon of green onions.
Mix the meatball mixture with a spoon or clean hands until fully integrated.
Spoon out 2 tbsp of meatball mixture at a time and roll into a ball. If they don't roll well, add more panko. Place the meatballs on the baking sheet.
Brush the tops of the raw meatballs with olive oil using a pastry brush.
Place the baking sheet in the oven, and bake at 375°F for 25-30 minutes until browned and the interior reaches 160°F.
Remove from the oven, brush with more sauce, and serve! Mix ¼ cup Hoisin sauce with 3 Tablespoons water for a tasty dip, if desired.