Combine Spicy Ranch Sauce ingredients in medium bowl; cover and refrigerate until ready to use.
Lightly shape ground beef into eight 3/4-inch patties. Place patties on grid over medium, ash-covered coals. Grill, uncovered, 11 to 13 minutes to medium (160°F) doneness, until no longer pink in center and juices show no pink color, turning occasionally. About 1 minute before burgers are done, top with cheese slices.
Line bottom of each bun with lettuce and tomato, as desired; top with burger. Spoon sauce evenly over burgers. Close sandwiches.
Makes 4 servings.
Nutrition information per serving: 535 calories; 31 g protein; 23 g carbohydrate; 34 g fat; 878 mg sodium; 106 mg cholesterol; 6.1 mg niacin; 0.4 mg vitamin B6; 2.5 mcg vitamin B12; 3.6 mg iron; 6.5 mg zinc.
Courtesy of the Cattlemen's Beef Board and the National Cattlemen's Beef Association.