Preheat the oven to 375°F.
Line a baking sheet with parchment paper.
In a large bowl whisk together the egg, milk, and 1 tablespoon buffalo sauce. Add the breadcrumbs, garlic powder, salt, and black pepper, and stir well.
Add the ground chicken and use your hands or a fork to gently combine the ingredients just enough so everything is mixed through.
Don’t over mix or the meatballs will be tough. The mixture will be soft and sticky.
Scoop up about a tablespoon of chicken mixture and roll it into a ball, and set it on the prepared baking sheet. Meatballs will feel wet.
Repeat with the remaining chicken. You will have about 20 little meatballs.
Bake the meatballs until they are golden on the bottom and cooked through, about 15 minutes.
Using the edges of the parchment paper, roll the meatballs to the center of the baking sheet and drizzle the remaining 1/4 cup buffalo sauce over them. Roll the meatballs in the sauce. Transfer them onto a plate and scatter the scallions on top. Serve with toothpicks and a small bowl of extra sauce on the side.