Preheat your oven to 425°F.
Rinse the quinoa under cold water. Combine quinoa with 2/3 cup water in a small saucepan. Bring to a boil, then reduce heat, cover, and simmer for 12-15 minutes until water is absorbed. Fluff with a fork.
While the quinoa cooks, chop the broccoli into florets and dice the small onion.
Lightly spray a baking sheet with non-stick cooking spray. Spread the broccoli florets and diced onion on the sheet. Season with a pinch of salt, pepper, garlic powder, and cumin. Roast in the oven for 15-18 minutes until tender and lightly browned.
Heat a skillet over medium heat and add the lean ground beef. Break the meat into crumbles and season with salt, pepper, and a pinch more of garlic powder if desired. Cook until the beef is browned and cooked through, about 6-8 minutes. Drain any excess fat.
Assemble your power bowl by adding the cooked quinoa as a base, topping with the cooked ground beef, and then layering on the roasted broccoli and onions.
Serve warm and enjoy your balanced, protein-rich power bowl.