Creating Sticky Mongolian Meatballs and Broccoli is straightforward if you follow these simple steps:

1. Preheat the Oven: Preheat your oven to 400°F (200°C).
2. Make the Meatballs: In a large bowl, combine ground beef, breadcrumbs, green onions, egg, garlic, ginger, soy sauce, salt, and pepper. Mix until well combined.
3. Form Meatballs: Shape the mixture into meatballs, about 1 inch in diameter, and place them on a baking sheet lined with parchment paper.
4. Bake the Meatballs: Bake the meatballs in the preheated oven for 20 minutes or until browned and cooked through.
5. Prepare the Sauce: In a saucepan, combine soy sauce, brown sugar, rice vinegar, sesame oil, and red pepper flakes. Cook over medium heat until the sugar dissolves.
6. Thicken the Sauce: Add the cornstarch mixture to the sauce and stir until thickened. Remove from heat.
7. Cook the Broccoli: While the meatballs are baking, heat olive oil in a skillet over medium heat. Add broccoli, season with salt and pepper, and sauté for about 5-7 minutes until tender but still crisp.
8. Combine: Once the meatballs are done, toss them in the sauce until fully coated.
9. Serve: Arrange the meatballs on a plate next to the sautéed broccoli.

These steps will guide you in creating this incredible dish with ease.