Preheat the oven to 350°F and line a 9x13 baking sheet with parchment paper.
In a small bowl, combine the ingredients for the homemade burger sauce, set aside or in the fridge until ready to serve.
1/3 cup mayonnaise, 3 Tbsp ketchup, 2 tsp pickle juice, 1 Tbsp pickles, chopped, ¼ tsp ground black pepper, ¼ tsp paprika
In a large skillet, cook the cubed bacon over medium heat for 4–5 minutes, stirring occasionally, until browned and cooked through. (If you are skipping the bacon, simply start with the ground beef in the next step.)
8 oz bacon, finely cubed
If using bacon, leave it in the skillet and add the ground beef and chopped onion. Use a spatula to break the beef into small pieces as it cooks.
1 lb ground beef, (90/10 or 80/20 fat content), 1/2 cup yellow onion, finely chopped
Season the ground beef with the seasonings. Continue cooking for 3–4 minutes, stirring occasionally, until the beef is fully browned and no longer pink. Remove the skillet from the heat.
½ tsp salt, ½ tsp garlic powder, ½ tsp paprika, ½ tsp black pepper
Using a large serrated knife, carefully slice the dinner rolls in half horizontally, keeping the rolls together as one piece. Place the bottom half of the rolls into the prepared baking dish.
12 Hawaiian rolls
Spread the mayo evenly over the bottom half of the rolls. Place the sliced cheese over the sauce, covering the buns as evenly as possible.
3 Tbsp mayo, 4 slices cheddar cheese or colby jack cheese
Spoon the cooked beef mixture evenly over the cheese, making sure the filling reaches the edges of the rolls.
Sprinkle the shredded cheese evenly over the beef. Place the top half of the rolls over the filling, with the cut side facing down.
1 1/2 cups shredded Mexican cheese
Brush the tops of the rolls with melted butter, then sprinkle evenly with sesame seeds.
1 ½ Tbsp salted or unsalted butter, melted, Sesame seeds, optional
Bake at 350°F for 12–15 minutes, or until the cheese is melted and the tops of the rolls are golden brown.
Let the sliders cool for 2–3 minutes before cutting them apart. Serve warm with the homemade burger sauce for dipping.