Preheat the oven to 400°F. Line a rimmed baking sheet with parchment paper. Mix together the flour, baking powder, garlic powder, salt, pepper, onion powder, and cayenne pepper in a large bowl until well combined.
Stir in the cheese and toss until the shreds of cheese are coated.
Mix in the sausage, milk, and melted butter, stirring until the mixture is uniform.
Scoop the mixture into 1 ½- to 2-inch balls using a cookie scoop, and place on the prepared baking sheet. Bake for 20 to 23 minutes or until the sausage balls are golden brown and cooked all the through.
Transfer the hot sausage balls to a platter and sprinkle with the green onions. Serve with desired sauces for dipping.