Heat gas or charcoal grill. To make chipotle guacamole, mash avocado in medium bowl with fork. Add cumin, garlic salt and chile; mix well.
When grill is heated, sprinkle both sides of beef steaks with salt and pepper; place on gas grill over medium heat or on charcoal grill 4 to 6 inches from medium coals. Cover grill; cook 8 to 10 minutes or until of desired doneness, turning once. Serve steaks with chipotle guacamole.