Roasted Brussel Sprouts with Bacon and Onions

1 package frozen brussel sprouts
Handful of sliced onions
Olive oil
Salt, Garlic, Pepper
1/2 c parmesan

Preheat oven to 450F.  Dump brussel sprouts in a roasting pan and layer onions on top.  Drizzle with oil and sprinkle with salt, garlic, and pepper.  Roast for 45 minutes.  Take out and toss with cheese.