Step 1: Preheat & Prep

• Preheat oven to 350°F (175°C).

• Line a 9×13-inch baking dish with parchment paper for faster cleanup (saves ~15 mins!).

Step 2: Slice the Rolls

• Use a serrated knife to slice the whole sheet of Hawaiian rolls in half horizontally—keep them intact.

• Place the bottom layer into the prepared dish.

Pro tip: Gently press down on the rolls while slicing for an even cut.

Step 3: Make the Horseradish Mayo

• In a small bowl, combine mayonnaise and horseradish.

• Adjust horseradish to taste—start with 1 tbsp if you prefer less heat.

Step 4: Layer the Good Stuff

• Spread the mayo mixture over the bottom rolls.

• Add half the cheese, all the roast beef, optional caramelized onions, and the remaining cheese.

💡 The cheese-on-both-sides trick helps keep your sliders from getting soggy!

Step 5: Make the Butter Glaze

• Melt butter in a microwave-safe bowl.

• Stir in Worcestershire, Dijon mustard, dried onion, sesame seeds, garlic powder, salt (and red pepper flakes if using).

Step 6: Glaze & Assemble

• Place the top half of rolls on.

• Brush the butter glaze generously over the tops and sides.

Step 7: Bake

• Cover the dish with foil and bake for 15 minutes.

• Remove foil and bake 5 more minutes until golden and bubbly.

• Ensure internal temp hits 165°F (74°C) for safety.

Step 8: Rest & Serve

• Let rest for 5 minutes.

• Slice along roll lines and serve warm.