GRILL DIRECTIONS: Heat grill. In medium bowl, combine ground turkey, bread crumbs, chili powder and garlic salt; mix well. Shape mixture into four 5-inch patties.
When ready to grill, oil grill rack. Place patties on gas grill over medium-high heat or on charcoal grill 4 to 6 inches from medium-high coals. Cook 10 to 15 minutes or until no longer pink in center, turning once.
Meanwhile, in blender container, combine mayonnaise, avocado, lemon juice and garlic powder. Cover; blend until smooth.
To serve, spread bottom halves of buns with mayonnaise mixture. Top with turkey burgers, tomato slices and sprouts. Cover with top halves of buns.