Prepare two rimmed baking sheets by lining them with tin foil, and then covering each with a sheet of parchment.
Place the bacon on the baking sheets in a single layer, and disperse the brown sugar evenly over the bacon slices. Sprinkle each slide with Cajun spice.
Put the baking sheets into the cold oven and turn it on to 400° F. Bake for 17 – 22 minutes, depending on how thick the bacon slices are and how your oven runs temperature wise. If not completely cooked to your liking, check every couple of minutes until done. SEE NOTE
Remove the bacon from the oven and transfer slices to a plate lined with paper towel.
As the bacon approaches the final minutes of baking, be sure to check each pan for doneness. Depending on your oven, one pan may cook more quickly, so be sure to adjust cooking times accordingly. It may be necessary to remove one pan from the oven before the other. ALWAYS know that when baking your bacon in the oven, it can go from being cooked perfectly to burnt in no time.