01 - Preheat your oven to 400°F and line a baking sheet with parchment paper for easy cleanup.
02 - In a large bowl, combine ground beef, minced garlic, chopped green onions, egg, soy sauce, panko breadcrumbs, sesame oil, gochujang, brown sugar, grated ginger, black pepper, and salt. Mix until just combined, being careful not to overwork the meat.
03 - Form the mixture into 20 to 24 bite-sized meatballs, approximately 1 tablespoon each, and arrange them on the prepared baking sheet spaced evenly apart.
04 - Bake for 20 to 25 minutes, turning once halfway through cooking, until the meatballs are browned on the outside and cooked through to an internal temperature of 160°F.
05 - While the meatballs bake, whisk together mayonnaise, sriracha, lime juice, sesame oil, honey, and a pinch of salt in a small bowl until smooth and well combined. Adjust sriracha to taste for desired heat level.
06 - Arrange the cooked meatballs on a serving platter, sprinkle generously with toasted sesame seeds and sliced green onions, and serve hot with the spicy mayo dip on the side for dipping.