01 - Preheat oven to 400°F. 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—do not overmix.
03 - Form the mixture into 20–24 bite-sized meatballs, approximately 1½ inches each. Arrange evenly on the prepared baking sheet.
04 - Bake for 20–25 minutes, turning once halfway through cooking, until meatballs are browned on all sides and cooked through to an internal temperature of 160°F.
05 - While meatballs bake, whisk together mayonnaise, sriracha, lime juice, sesame oil, honey, and salt in a small bowl until smooth. Adjust sriracha amount to achieve desired spice level.
06 - Transfer cooked meatballs to a serving platter. Sprinkle generously with toasted sesame seeds and sliced green onions. Serve immediately with spicy mayo dip on the side.