2 lb lean ground beef
1/2 Tbsp olive oil
1 tsp salt
1 tsp black pepper
1 tsp garlic powder
1/2 large yellow onion, finely diced
1/4 cup mayonnaise
8 slices medium cheddar cheese
6 oz medium cheddar, shredded
24 dinner rolls
2 Tbsp unsalted butter, melted, plus more to grease baking sheet
1 Tbsp sesame seeds
Preheat oven to 180˚C. Butter the bottom of a rimmed baking sheet.
Place a large skillet over medium/high heat with 1/2 Tbsp olive oil. Add diced onion then 2 lbs ground beef and break up with a spatula. Season with 1 tsp salt, 1 tsp black pepper, and 1 tsp garlic powder. Sautee over medium/high heat, breaking up the beef and cook just until cooked through then remove from heat.
Tilt skillet to spoon off and discard excess fat. Stir in 1/4 cup mayo.
Cut buns in half. Place bottom half of dinner rolls on buttered baking sheet and line bread with sliced cheese. Spread ground beef mixture evenly over the sliced cheese, using the back of a spatula to square off the edges. Cover the ground beef with the shredded cheddar.
Place the top of buns, cut-side down, over the burgers. Brush tops with 2 Tbsp melted butter and immediately sprinkle tops with sesame seeds. Bake for 12-15 minutes, or until cheese is melted and tops are golden brown.