Preheat the oven to 425 and line a baking sheet with foil. Spray with cooking spray.
Lay the asparagus on the pan in a single layer and sprinkle with the olive oil, garlic salt and pepper. Use your hands to toss and make sure everything gets coated.
Lay the asparagus back into a single layer and sprinkle with the parmesan cheese.
Bake for 10 to 15 minutes until the asparagus is fork-tender.
Notes
Thinner asparagus will take closer to 10 minutes and thicker asparagus will take 15+ minutes.