Creating Beef Meatball Stir-Fry is straightforward when you follow these steps:

1. Make the Meatballs: In a large bowl, combine ground beef, breadcrumbs, Parmesan cheese, egg, minced garlic, salt, black pepper, and red pepper flakes. Mix well until fully combined.
2. Form the Meatballs: Shape the mixture into small meatballs, about 1 inch in diameter. Set aside.
3. Heat the Oil: In a large skillet or wok, heat olive oil over medium-high heat.
4. Cook the Meatballs: Add the meatballs to the pan in a single layer. Cook for about 6-8 minutes, turning occasionally, until browned and cooked through.
5. Add Vegetables: Add sliced bell pepper, broccoli, snap peas, and julienned carrot to the skillet. Stir-fry for about 5 minutes until the vegetables are tender-crisp.
6. Prepare the Sauce: In a small bowl, mix together soy sauce, honey, rice vinegar, and the cornstarch-water mixture.
7. Combine Sauce and Meatballs: Pour the sauce over the meatballs and vegetables in the skillet. Stir to coat everything evenly. Cook for an additional 2-3 minutes until the sauce thickens slightly.
8. Garnish: Remove from heat and garnish with sesame seeds and chopped green onions if desired.
9. Serve Hot: Transfer the stir-fry to a serving dish and enjoy immediately.

This step-by-step guide ensures that anyone can prepare this incredible dish with ease. Each step builds upon the last, resulting in a satisfying meal bursting with flavor.