Preheat the oven to 425 degree (F) and lightly grease a baking sheet.
Place Brussel Sprouts into a gallon sized ziploc bag and add the olive oil, breadcrumbs, Parmesan, garlic salt, and pepper.
Seal the bag closed and give it a good shake until all is evenly coated.
Open bag and pour into an even layer on prepared baking sheet.
Place baking sheet into oven and allow to cook for about 15-17 minutes, or until slightly golden brown.
Remove from oven and serve! *Sprinkle additional Parmesan on top if desired.