Preheat the oven to 375º F (180º C) with heat coming only from the top if possible. On a small pan over medium heat on the stove, put the bacon pieces and cook for about e minutes until crunchy.
On a baking sheet lined with some parchment paper, spread some ranch dressing. Then, add the sweet potato fries on top along with the bacon.
Spread the mozzarella and cheddar cheese on top and bake for about 7 minutes until both cheeses melt and turn slighty golden brown. Then take out of the oven.