Wash hands and ensure cooking area is clean. Dice chicken into bite-sized pieces and season with salt and pepper. Optionally marinate in soy sauce and ginger for 30 minutes.
Preheat oven to 400°F. Peel and dice sweet potatoes, toss with olive oil, garlic powder, paprika, salt, and black pepper. Spread on a baking sheet and roast for 20-25 minutes.
Cook brown rice according to package instructions, typically combining 1 cup of rice with 2 cups of water and simmering for 45 minutes.
In a skillet over medium heat, cook chicken for 6-8 minutes until no longer pink. Add broccoli and cook for an additional 3-4 minutes. Combine with roasted sweet potatoes and drizzle with soy sauce.
Serve the chicken and vegetable mixture over the cooked brown rice and garnish with chopped green onions.