Ingredients

• 8 medium slices sweet onion , such as Vidalia®
• 1 tablespoon balsamic vinegar
• 1 pound extra-lean ground beef
• 0.25 teaspoons salt
• 0.25 teaspoons freshly ground black pepper
• 1 serving cooking spray
• 8 , 1 ounce
• 3 tablespoons Dijon-mayonnaise blend , such as Hellman's® Dijonnaise™
• 1 cup shredded reduced-fat Jarlsberg cheese

Instructions

1. 1 Arrange onion slices on a plate and drizzle vinegar over top. Divide beef into 4 equal portions, shaping each into a 1/2-inch thick patty. Season patties with salt and pepper.
2. 2 Heat a large grill pan over medium heat. Coat the pan with cooking spray and add onion. Cover and cook for 6 minutes, flipping halfway. Remove from pan, cover, and keep warm.
3. 3 Heat the grill pan over medium-high heat. Coat with more cooking spray and add patties. Cook until no longer pink in the centers, about 3 minutes per side. An instant-read thermometer inserted into the center should read at least 160 degrees F (71 degrees C). Remove patties to a plate, drain and discard any grease, and wipe the pan clean with a paper towel.
4. 4 Spread Dijon-mayonnaise blend evenly over all bread slices. Layer 4 of the slices with 2 tablespoons Jarlsberg cheese, 1 beef patty, 2 onion slices, and 2 tablespoons Jarlsberg. Place remaining bread slices mustard-side down on top of the sandwiches.
5. 5 Heat the grill pan over medium heat and coat with cooking spray. Add sandwiches to the pan and place a cast iron or other heavy skillet on top, pressing gently to flatten sandwiches. Cook until bread is toasted, about 3 minutes per side, leaving the skillet on top as they cook.

Nutrition per serving