Place the sprouts in a large bowl. Melt the butter and then pour the butter over the sprouts. Add the garlic and 2 tablespoons of parmesan. Stir to combine.
Spread the brussels sprouts out on a parchment-lined baking sheet. Then sprinkle the remaining parmesan over, and generously sprinkle with salt and pepper.
You can roast the brussels sprouts at 350-400 degrees, I am going to assume you are serving these as a side dish, so just place them in the oven alongside your meat.