Preheat your oven to 400°F (200°C).
In a large mixing bowl, combine the ground chicken, chopped green onions, garlic powder, kosher salt, ground black pepper, egg, and whole wheat breadcrumbs. Mix everything well until just combined; be careful not to overwork the meat.
Use your hands to form the mixture into meatballs, about 1.5 inches in diameter. Place them on one side of the sheet pan, leaving space between each meatball.
In a separate bowl, toss the chopped broccoli with olive oil, salt, and pepper. Make sure every piece is well-coated.
Spread the seasoned broccoli on the other side of the sheet pan, next to the meatballs.
Place the sheet pan in the preheated oven and roast for about 20-25 minutes, or until the meatballs are cooked through and the broccoli is tender and slightly crispy.
Once done, take the sheet pan out of the oven and let it cool for a few minutes. Serve warm.
