Gather the ingredients. Preheat the oven to 400 degrees F (205 degrees C). Grease a baking sheet with cooking spray.

Lightly spray asparagus with cooking spray; place onto the prepared baking sheet.

Bake in the preheated oven until tender, about 12 minutes, flipping spears halfway through.

Meanwhile, mix Parmesan cheese and garlic salt together in a small bowl.

Remove asparagus from the oven and sprinkle Parmesan mixture over top.