Preheat the Oven: Preheat your oven to 375°F (190°C). Line a baking sheet with parchment paper or a silicone baking mat.
Prepare the Broccoli: Finely chop the steamed and drained broccoli. You can use a food processor for a finer texture.
Mix the Ingredients: In a mixing bowl, combine the chopped broccoli, shredded cheddar cheese, grated Parmesan cheese, breadcrumbs, minced garlic, eggs, salt, black pepper, and onion powder. Mix until well combined.
Form the Balls: Scoop about 1 tablespoon of the mixture and roll it into a ball. Place the balls on the prepared baking sheet.
Bake the Balls: Bake in the preheated oven for 18-20 minutes, or until the balls are golden brown and crispy.
Cool and Serve: Remove the balls from the oven and let them cool slightly before serving.