Preheat & Prepare: Set your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Mix the Meatballs: In a large bowl, combine beef, garlic, ginger, green onions, egg, breadcrumbs, soy sauce, sesame oil, gochujang, brown sugar, rice vinegar, and seasoning. Mix gently with your hands or a spatula until just combined. (Don’t overmix — that’s the secret to tender meatballs.)
Shape & Bake: Form the mixture into 1-inch balls and arrange them evenly on the baking sheet. Bake for 18–20 minutes, or until browned and fully cooked.
Make the Spicy Mayo: While the meatballs bake, whisk together mayonnaise, gochujang, lime juice, and honey in a small bowl until smooth and creamy.
Serve & Garnish: Arrange warm meatballs on a platter, drizzle with the spicy mayo (or serve it on the side), and sprinkle with sesame seeds and scallions.