We suggest cutting the bacon into thirds because if you leave the strips any longer they will never crisp up. There may be a few pieces of bacon left over. Do not use thick cut, it won't crisp up.
You can make this ahead and bake when you are ready!
Letting them sit with the brown sugar for 1 to 2 hours in the refrigerator before baking makes all the difference in flavor.
As for the pan you use, this makes a big difference. I asked my mom how she did it and she said she uses a glass baking dish, not a foil-lined baking sheet. To clean up after, she fills the pan with hot tap water and lets it sit for a few minutes. The caramelized sugar dissolves away.
Use regular sliced bacon, not thick cut. Thick cut will not crisp before the brown sugar caramelizes.
Pack the wrapped smokies snugly into the dish so the brown sugar sits on top of them rather than running into the gaps.