Preheat oven to 375 degrees. Line a large baking sheet with aluminum foil (you may need to use two).
(Please wear gloves for this next step to keep your hands from burning!) Slice jalapeño peppers lengthwise and chop off stems. Discard seeds and membranes after scooping out with a spoon.
Combine cream cheese and ranch dressing mix in a small bowl, mixing thoroughly. Spread a small scoop of cream cheese mixture inside of each jalapeño pepper half, then carefully wrap with a slice of bacon.
Place jalapeños on prepared baking sheet and bake in preheated oven for 25-30 minutes, or until bacon is crispy and edges of jalapeño peppers are beginning to brown.
To crisp bacon even more, turn broiler to high and broil for 2-3 minutes, or until bacon is cooked to your liking.