Preheat oven to 400°F (200°C) and line a baking sheet with parchment paper.
In a large bowl, combine ground chicken, mozzarella, Parmesan, egg, almond flour, garlic, parsley, and seasonings.
Mix gently until all ingredients are combined.
Shape the mixture into small meatballs using your hands or a scoop.
Place meatballs on the baking sheet and bake for 20–25 minutes until cooked through.
Mix buffalo sauce with melted butter in a bowl.
Toss the cooked chicken meatballs in the buffalo sauce until evenly coated.
Garnish with green onions and serve warm.