How to Make It
Heat the oven to 450°. In a small saucepan, melt the butter over moderate heat and cook until golden brown, about 2 minutes. Remove from the heat and cover to keep warm.
Snap off the tough ends of the asparagus and discard them. On a large baking sheet, toss the asparagus with the oil, salt and pepper. Spread the asparagus out on the baking sheet and roast until just tender, 5 to 7 minutes for thin spears, 8 to 10 minutes for medium or 10 to 12 for thick spears.
Transfer the asparagus to a platter or individual plates and pour the brown butter over the spears.