first, preheat the oven to 400 degrees with the baking sheet inside of it to preheat, too.
Now rinse and dry the Brussels sprouts really well. Make sure they're very dry so they roasting the oven nicely.
Then trim off the stem and cut them down the middle. Add them to a medium sized bowl.
Now drizzle them in olive oil and season them with salt, pepper and garlic powder.
Then add the parmesan cheese and toss everything together until its evenly combined
Next remove the baking sheet from the oven once its reached 400 degrees and add the Brussels sprouts to it. BE CAREFUL it will be very hot. Arrange the sprouts cut side down on the baking sheet.
Bake the brussels sprouts in the oven for about 30 minutes or until they're golden brown. Transfer to a baking dish and enjoy.