Preheat oven to 350°F.
Combine the beef and spices in a bowl.
2 lbs lean ground beef, 2 tsp garlic powder, 1 tsp kosher salt, 2 tsp ground black pepper
Press the beef into the bottom of a 9x13-inch baking dish into a flat and even layer.
Bake for 20 minutes. Drain the liquid and set aside.
Slice the rolls in half lengthwise. Place the bottom half in a lined baking pan.
Top the bottom half of the rolls with the cooked beef.
In a large skillet set over medium-high heat, add the olive oil. Add in the diced onion and stir to coat. Cook until the onion is translucent and fragrant.
1 tbsp olive oil, ½ white onion
Top the beef with the cooked onions, cheese, and top half of the bun.
12 slider-sized Hawaiian rolls
In a small bowl, combine the melted butter and all other ingredients for the butter topping.
¼ cup unsalted butter, ½ tsp kosher salt, 2 tbsp brown sugar, 3 tsp Worcestershire sauce, 2 tbsp Dijon mustard, ½ tbsp sesame seeds
Brush the tops of the rolls liberally with melted butter (or pour it over) mixture and sprinkle the sesame seeds on top.
Bake for an additional 20 minutes, or until the bread is toasted and the cheese is melty.
Slice into individual sliders and serve hot. Enjoy!