Preheat oven to 400ºF.
In a large mixing bowl, combine the ground chicken with the onion, garlic and parsley, and season with salt and freshly ground black pepper. Flatten out the meat in the bowl and score it into four portions using the side of your hand. Shape each portion into four balls – you should have sixteen meatballs in total.
Arrange the meatballs on a nonstick sheet pan and drizzle them with EVOO. Place in the oven and bake until the meatballs are cooked through and golden brown, about 10-12 minutes.
While the meatballs are baking, melt the butter in a large skillet over medium heat. Add the hot sauce and whisk to combine. Toss the baked meatballs in the hot sauce to coat.