Place green beans in a large bowl. Drizzle with olive oil, then sprinkle on some garlic powder, salt, and pepper. Toss to coat.
Once the sweet potatoes are done, remove them from the oven and, with a spatula, shove them to one side of the sheet pan to make room for the salmon and green beans. Then, place the salmon and green beans onto the sheet pan. Transfer the sheet pan to the oven and bake for 10-15 minutes, or until the salmon is opaque, flaky, and has an internal temperature of 145º F.
When done, remove the sheet pan from the oven. Brush some extra hoisin glaze over the salmon fillets—as much as you want! Then, sprinkle some thinly sliced scallions and sesame seeds over the fillets. Serve with lime wedges.