1. Crumble ground beef in mixing bowl. Add onion and 2 tablespoons Smoky Paprika Chipotle; mix thoroughly. Form mixture into 4 round patties, ½-inch thick.
2. Meanwhile in a separate bowl, make a spread with 1 tablespoon Smoky Paprika Chipotle, mayonnaise, and sour cream; mix until well blended. Cover and refrigerate.
3. Prepare grill for direct cooking over medium heat. Place patties on grid of grill. Grill, uncovered 11-13 minutes or until centers are no longer pink, turning once.
4. About 1 minute before burgers are done, place cheese slice on top.
5. Place bun halves, cut side down, on grid of grill. Grill 1-2 minutes or until buns are lightly toasted. Place burgers on bun; top with slice of tomato, avocado and tablespoon of spread.
