Preheat oven to 425 degrees F. Line a large baking sheet with parchment paper; set aside.

Add cauliflower florets to a gallon-sized resealable bag. Pour olive oil on top, seal bag and toss to coat.

In a small bowl, combine salt, garlic powder, pepper and parmesan cheese. Sprinkle on top of cauliflower then seal bag and shake until cauliflower is evenly coated.

Spread in an even layer on prepared pan and bake for 15 minutes or until fork tender.