Preheat oven to 400 degrees F and place rung onto top rack.
In an oven safe/stove safe cast iron skillet, heat 1 tablespoon bacon grease.
Once hot, add in jalapeno, green onions, and garlic.
Cook 60 seconds and set aside.
In a large stockpot, boil water.
Once boiling, remove from heat and stir in potatoes.
Let stand one minute, then stir in bacon, jalapeno mixture, mayo, sour cream, ranch seasoning, cheddar, and mozzarella.
Place potato mixture into the oven safe/stove safe cast iron skillet.
Top with remaining cheddar, mozzarella, and crushed potato chips.
Bake in preheated oven for 10 minutes.
Serve with more potato chips and crackers!