While chicken cooks, stir together hoisin, sriracha, honey, and 2 TBSP water in a small bowl. Once broccoli and sweet potatoes have roasted halfway, remove from oven. Flip sweet potatoes and return to oven. Toss broccoli with half the ginger and a drizzle of oil. Return to oven and continue roasting until both veggies are done, 10-15 minutes.