Making Sticky Mongolian Beef Meatballs is a straightforward process. Follow these steps to create a delicious dish:

1. Preheat Oven: Preheat your oven to 400°F (200°C). Line a baking sheet with parchment paper for easy cleanup.
2. Mix Ingredients: In a large bowl, combine ground beef, breadcrumbs, green onions, garlic, ginger, egg, and 2 tablespoons of soy sauce. Mix until well combined.
3. Form Meatballs: Shape the mixture into meatballs, about 1 to 1.5 inches in diameter. Place them on the prepared baking sheet.
4. Bake Meatballs: Bake in the preheated oven for 15-20 minutes, until cooked through and browned.
5. Prepare Sauce: While the meatballs bake, mix remaining soy sauce, hoisin sauce, brown sugar, and sesame oil in a small saucepan. Heat over medium-low, stirring until the sugar dissolves and the sauce thickens slightly.
6. Coat the Meatballs: Remove the meatballs from the oven and carefully transfer them to the saucepan. Gently toss to coat evenly in the sauce.
7. Serve: Place meatballs on a serving platter. Drizzle any remaining sauce over the top and garnish with sesame seeds and chopped green onions.