Slice the onions into 2/3 inch rings. Reserve the small inside rings for other recipes; you want large rings that are easy to wrap in bacon. Some rings may be small enough to use 1/2 slice of bacon.
Wrap each onion slice tightly in bacon and use a toothpick to hold in place.
Place onto a cookie sheet (with edges!) and bake for 25-30 minutes.
Serve with desired dipping sauce.
TIP: Use thinly sliced bacon, thick bacon is very difficult to wrap around the onion ring.