Place the frozen broccoli in a microwave-safe bowl and microwave on HIGH for 5-6 minutes; cool and squeeze out any excess moisture with hands, place in a large bowl.
Add in stuffing mix, Parmesan cheese, cheddar cheese, onion, beaten eggs, seasoned salt, garlic powder, black pepper and cayenne to taste (if using) mix until combined adjusting seasoned salt and pepper to taste.
Cover and refrigerate for 4 or more hours or until all the moisture is absorbed and the mixture is completely cold.
Shape into 1 or 1-1/2-inch balls, then place onto greased baking sheet.
Set oven to 325.
Bake for 12-15 minutes for 1-inch balls (bake a little longer for 1-1/2-inch balls) or until browned.
If desired immediately sprinkle finely grated cheddar cheese on top.