Creating these phenomenal Korean BBQ Meatballs with Spicy Mayo Dip is quite straightforward. Follow these simple steps:

1. Preheat the Oven: Preheat your oven to 400°F (200°C), and line a baking sheet with parchment paper to prevent sticking.

2. Prepare the Meatball Mixture: In a large mixing bowl, combine the ground beef, breadcrumbs, green onions, minced garlic, grated ginger, soy sauce, sesame oil, brown sugar, egg, and black pepper. Mix until well combined.

3. Shape the Meatballs: Scoop out small portions of the mixture (about 1 inch in diameter) and roll them into balls. Place them on the prepared baking sheet, leaving some space between each meatball.

4. Cook the Meatballs: Bake the meatballs in the preheated oven for about 20 minutes or until they are browned and cooked through.

5. Prepare the Spicy Mayo Dip: While the meatballs are baking, mix together the mayonnaise, gochujang, rice vinegar, honey, garlic powder, and a pinch of salt in a small bowl. Adjust the spice level to your preference.

6. Garnish the Meatballs: Once cooked, remove the meatballs from the oven and sprinkle sesame seeds on top for a lovely garnish.

7. Serve: Arrange the meatballs on a serving platter alongside the spicy mayo dip.