You can use Stainless Steel Baking Rack for this.
- Preheat oven to 400°. Line a medium baking sheet with aluminum foil and fit with a metal cooling rack.
- Cut onion into 1/2″ rings, then separate every other ring, so that each ring contains two rounds of onion. Stir together brown sugar and cayenne pepper on a large shallow plate, then lay bacon on mixture to coat. Wrap doubled up rings with bacon, then set on baking sheet. Bake 30 to 35 minutes, or until bacon is crisp and golden. Serve with Ranch, if using.