- Cut two hamburger buns into 1/4-inch cubes. Combine cubed buns, beans and tomato paste in large bowl; using a potato masher; mash to slightly chunky consistency. Add ground beef, onion, cilantro, jalapeño pepper, cumin, salt and pepper, mixing lightly but thoroughly. Lightly shape into eight 3/4-inch thick patties.
Place patties on rack of broiler pan so surface of beef is 3 to 4 inches from heat. Broil 12 to 14 minutes until instant-read thermometer inserted horizontally into center registers 160°F, turning once.
Place burgers on bottoms of buns. Top burgers evenly with avocado slices. Top with dressing, sour cream, yogurt or salsa, if desired. Close sandwiches.
Nutrition information per serving: 386 Calories; 108 kcal Calories from fat; 12 g Total Fat; 3 g Saturated Fat; 6 g Monounsaturated Fat; 56 mg Cholesterol; 605 mg Sodium; 47 g Total Carbohydrate; 7.7 g Dietary Fiber; 27 g Protein; 5.2 mg Iron; 7.4 mg Niacin; 0.4 mg Vitamin B6; 1.6 mcg Vitamin B12; 4.3 mg Zinc; 14.4 mcg Selenium; 62.2 mg Choline;