Preheat the oven to 425°F (220°C) and line a large baking sheet with parchment paper.
In a large mixing bowl, combine the ground beef, breadcrumbs, milk, minced garlic, sliced scallion whites, salt, and red pepper flakes. Mix until evenly incorporated, then shape the mixture into 1 ½-inch meatballs and arrange them on the prepared baking sheet.
1 pound ground beef, ¼ cup bread crumbs, ¼ cup milk, 2 tablespoons garlic, ¼ cup thinly sliced scallions, 1 teaspoon salt, ½ teaspoon red pepper flakes
Lightly brush the tops of the meatballs with vegetable oil. Transfer the baking sheet to the oven and bake for 15 minutes.
2 tablespoons vegetable oil
Meanwhile, in a medium bowl, whisk together the sour cream, mayonnaise, buffalo hot sauce, rice vinegar, soy sauce, and honey until smooth. Set aside.
¼ cup sour cream, ¼ cup mayo, 2 tablespoons buffalo hot sauce, 2 tablespoons rice vinegar, 2 tablespoons soy sauce, 1 tablespoon honey
Once the meatballs are cooked, arrange them on a serving plate or over rice. Drizzle the prepared sauce over the top, then garnish with additional chopped scallions (green ends) and sesame seeds if desired.
Sprinkle of chopped scallions