Preheat the oven to 400°F. Line a rimmed sheet pan with parchment paper, and set a wire rack on top if you have one.
Pat the asparagus dry. Toss with the olive oil, garlic salt and pepper.
Divide the asparagus into 8 bundles of 3–4 spears. Wrap a slice of bacon in a spiral around each bundle and place seam side down on the pan.
Bake for 10 minutes. Turn the bundles with tongs and bake for 8–10 minutes more, until the bacon is browned and nearly crisp.
For crisper bacon, broil for 1–2 minutes, watching closely. Serve hot.