Set oven to 400°F (205°C). Lay bacon on a sheet pan and bake 7 minutes; take out of oven.
Cut off green bean ends. Heat salted water in a pot until boiling.
Put in green beans and cook 2–3 minutes until just tender. Drain and move to an ice water bath to halt cooking.
Dry green beans with paper towels. In a small bowl, combine garlic salt, melted butter, brown sugar, and pepper. Pour over green beans and toss to coat.
Wrap 8–10 green beans with a piece of bacon and fasten with a toothpick. Put bundles on a sheet pan coated with cooking spray.
Bake 15–20 minutes until bacon is crispy. Scatter parsley on top and serve.