Spread chips evenly on a large rimmed baking sheet. Top with pepper jack cheese, chicken, white cheddar cheese, half a Jalapeño, and black beans. Bake for 15 minutes, until cheese is melted.
Top nachos with green onions, tomatoes, and remaining Jalapeño. Place guacamole in a piping bag and evenly pipe guacamole onto nachos. Top with lettuce. Using the sour cream pouch, squeeze on lines in a football field fashion. Enjoy immediately.