Arrange asparagus in a single layer on a baking sheet (or tray). Spray with cooking oil spray; season with salt; and roast in preheated HOT oven until vibrant in colour and tender-crisp, (about 10 minutes).
While the asparagus is in the oven, heat a small saucepan / pot over medium heat. Add butter and cook, stirring constantly, until it melts, froths up and begins to turn golden in colour. Take off heat; add the garlic and stir quickly. Return to the heat for a further minute, while stirring, until the butter reaches a dark amber colour. Remove from heat; add lemon juice and stir to combine. Pour into a small serving jug.
To serve, drizzle browned butter over asparagus and sprinkle with parmesan cheese.
Notes
Be careful not to overcook your asparagus or it will lose all crunch and flavour.