Preheat oven to 400*. Line a baking sheet with foil.
In a bowl, mix together the cream cheese, ranch dressing powder, and pepper jack cheese until evenly combined.
Fill each jalapeno half with a tablespoon of the cheese mixture. Once halve is filled, wrap with a piece of bacon and secure closed with a toothpick.
Bake for about 20-25 minutes or until the bacon is crispy.