Ingredients:
- 2 lbs. lean ground beef, 90/10 ratio
- 1/2 Tbsp. olive oil
- 1 tsp. salt
- 1 tsp. black pepper
- 1 tsp. garlic powder
- 1/2 large sweet onion, finely diced
- 1/4 cup mayonnaise
- 10 slices Swiss cheese, or choice
- 8 oz. cheddar, shredded
- 24 sweet dinner rolls, cut and buttered
- 2 Tbsp. butter, melted, plus more to grease baking sheet
- 1 Tbsp. sesame seeds
Directions:
- Preheat oven to 350 F. Butter the bottom of a rimmed baking sheet.
- Place a large skillet over medium-high heat and add olive oil. Add diced onion and ground beef and break up with a spatula. Season beef with salt, pepper and garlic powder. Sauté over medium-high heat, breaking up the beef until cooked through; remove from heat. Spoon off and discard excess fat. Stir mayo into the ground beef.
- Cut buns in half. Butter top and bottom of buns. Place bottom half of dinner rolls on buttered baking sheet and top with sliced Swiss cheese. Spread ground beef mixture evenly over the sliced cheese. Cover the ground beef with shredded cheddar. Place the top of buns, cut side down, over the burgers.
- Brush tops with 2 tablespoons melted butter and immediately sprinkle tops with sesame seeds. Cover with foil.
- Bake at 350 F for 15 minutes` or until the cheese is melted and tops are golden brown.