1. Heat grill to medium-high heat. Grill jalapenos, turning as needed, until they are charred and blistered all over, about 7-8 minutes. Place jalapenos in a bowl and cover with plastic wrap for about 10 minutes to loosen skins. Peel off skin, cut in half, and remove seeds from jalapenos.
2. Chop roasted jalapenos and add half of them to the cream cheese (reserve rest for dressing). Mix well to combine.
3. Divide and form the beef into 8 equal pattties. Place ¼ of the jalapeno – cream cheese mixture onto 4 of the patties, and then top with the remaining 4 plain patties. Completely pinch sides closed to seal in the mixture and reform patties.
4. Season generously with Kosher salt.
5. Grill burgers over medium-high heat with grill-lid closed until cooked to desired doneness, about 3-6 minutes per side (brushing the grill first with a little bit of oil will prevent burgers from sticking). During the last minute of cooking, top each burger with cheddar cheese slice.
6. Assemble burgers on buns with bacon, avocado slices, and the avocado-jalapeno ranch dressing. Devour immediately.

For the Avocado-Jalapeno Ranch Dressing

1. Combine 1 avocado with ranch dressing in a food processor until smooth. Stir in remaining roasted jalapenos.