Preheat your oven to 400°F (200°C).
In a mixing bowl, combine ground beef, breadcrumbs, milk, Parmesan cheese, egg, garlic, salt, pepper, and ginger. Mix until well combined.
Form the mixture into meatballs, about 1 inch in diameter, and place them on a baking sheet.
Bake the meatballs in the preheated oven for about 15 minutes, until they are cooked through and browned.
While the meatballs are baking, prepare the sauce. In a small bowl, whisk together soy sauce, honey, cornstarch, rice vinegar, sesame oil, and red pepper flakes (if using) until smooth.
In a large skillet, heat olive oil over medium heat. Add broccoli florets and sauté for about 5 minutes, until they are bright green and tender-crisp. Season with salt and pepper.
Once the meatballs are done baking, transfer them to the skillet with broccoli. Pour the sauce over the meatballs and broccoli. Stir to combine and cook for an additional 5 minutes until the sauce thickens and everything is well coated.
Serve warm over rice or noodles if desired.