Form the Patties: Combine ground beef, seasoning, salt and pepper. Form 4 patties about 3/4" thick. Press a dimple in the center to prevent puffing.
Grill: Heat your grill to medium-high (400–450°F / 200–230°C). Grill patties 5–6 minutes per side until desired doneness (140°F for medium, 160°F for well-done).
Melt Cheese: Place a slice of pepper jack on each patty for the last minute of grilling.
Toast Buns: Lightly toast cut sides of the buns for ~1 minute on indirect heat.
Assemble: Spread lava sauce on bottom bun. Layer: sauced bun, cheesy patty, jalapeños, onions, tomatoes, lettuce, and finish with crushed chips. Top with the bun.
Rest: Let the burger sit 2–3 minutes before serving. Keep milk on the side!