Roast Beef Sliders
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Roast Beef Sliders with layers of provolone cheese and caramelized onions are smeared with horseradish aioli and topped with a yummy butter sauce. They’re guaranteed to be the hit of your holiday party or game day! Bake a batch or two of these easy party sandwiches and watch them disappear!
Sheila’s Recipe Snapshot for Roast Beef Sandwich Recipe
Warm and cheesy, everyone loves these sliders.
Have leftover holiday turkey? Try this Turkey Sliders Recipe next time.
Ingredient Notes for Roast Beef Sliders
- Meat | You’ll need a pound of thinly sliced deli roast beef for 18 sliders.
- Cheese | Either provolone, mozzarella, or Swiss cheese slices will work.
- Slider rolls | Mini sandwich rolls are the perfect size for handheld bites. Look for classic white, brioche, or potato slider buns depending on your flavor preference..
- Onions | Caramelizing the onions adds delicious depth of flavor to these sandwiches.
- Aioli | Start with prepared horseradish sauce to make a simple spread for the sandwiches.
- Butter | What makes these sandwiches so good is the buttery sauce on top! You can omit the aioli if you like, but don’t mess with the butter sauce!
- Poppy Seeds | Add a sprinkle of poppy seeds on top for crunch.
Variations and Substitutions
- Make Ham and Swiss Sliders. Substitute deli ham for the roast beef and replace the aioli with either honey mustard or garlic mayo. Layer with Swiss cheese and follow the rest of the recipe as written.
- The original King’s Hawaiian sweet rolls sold in 12-count packages may be used in place of the slider buns. If you use these rolls, you’ll need to slice them in half horizontally and bake them in a 9×13 baking dish.
- If you are running low on time, leave off the caramelized onions or try using a can of crispy French fried onion rings instead.
- No poppy seeds? You may substitute toasted sesame seeds for added crunch.
How to Make Roast Beef Sliders
It’s the caramelized onions that make these sliders shine — slow-cooked and full of down-home flavor.
CARMELIZE THE ONIONS. Thinly slice two sweet onions. Warm a tablespoon of olive oil in a skillet over medium-low heat. Add the onions and slowly cook until they are soft and change to a golden color, about 45 minutes.
MAKE THE AIOLI AND BUTTER SAUCE. Add prepared horseradish sauce, mayonnaise, and Dijon mustard to a small bowl and whisk until smooth. Season with salt and pepper to taste.
Melt the butter in a small saucepan, then stir in Worcestershire sauce, Dijon mustard, onion powder, and salt. Simmer on low heat for 5 minutes.
BUILD THE SANDWICHES. The King’s Hawaiian slider buns come pre-sliced, but if you use the dinner rolls instead, slice them in half horizontally (without separating the rolls). Place the bottom halves of the slider buns in two square 9-inch baking dishes.
Evenly spread the aioli on the bottom half of the buns. Layer 2 or 3 slices of roast beef on each bun and top with a cheese slice and caramelized onions.
BRUSH WITH BUTTER SAUCE. Lay on the top buns and pour or brush the butter sauce all over, allowing it to drip between the buns and over the sides. Sprinkle the top of the sliders with poppy seeds for a nice little crunch.
BAKE. Cover the sliders with aluminum foil and bake in a 350 degree oven for 20 minutes. Remove the foil and bake another 10 minutes, until the buns are browned and the cheese is melted.
More Recipe Success Tips
Storage and Reheating Tips
- To freeze, make up the sandwiches as directed, but leave off the melted butter sauce. Wrap in aluminum foil and store in a Ziploc freezer bag for up to 2 months.
- When ready to serve, thaw in the refrigerator overnight. Add the butter sauce to the tops and bake.
- To reheat, wrap in aluminum foil and warm in a 350-degree oven until heated through.
Frequently Asked Questions
Provolone, Swiss, or cheddar all melt beautifully and pair well with roast beef. Pick your favorite or mix and match for extra flavor.
The only change I’d suggest if you want to substitute deli ham for the roast beef is leaving off the horseradish aioli. Otherwise, follow the recipe as written.
Looking for More Delicious Sandwich Recipes?
Serve Slow Cooker Pulled Chicken on buns with a tangy coleslaw or pickled red onions, or try my Rachel Sandwich (Turkey Reuben) for a quick and easy dinner.
What to Serve With Roast Beef Sliders on Hawaiian Rolls
When I serve roast beef sliders as the main dish, I like to pair them with chips or oven roasted red potatoes and a green salad. For parties, I’ll add a nice dip, either cheesy shrimp dip or white bean hummus, and lemon garlic smashed potatoes.
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Roast Beef Sliders
A horseradish aioli and caramelized onions make these roast beef sliders extra tasty!
Ingredients
- 2 large sweet onions
- 1 tablespoon olive oil
- 2 (9-count) pkgs. King's Hawaiian Sweet Slider Buns
- 1 lb. sliced deli roast beef
- ½ lb. sliced provolone cheese
Horseradish Aioli
- 2 tablespoons prepared horseradish
- 2 tablespoons mayonnaise
- 1 tablespoon Dijon mustard
- ¼ teaspoon kosher salt
- ⅛ teaspoon black pepper
Butter sauce
- 8 tablespoons unsalted butter
- 1 tablespoon Worcestershire sauce
- 1 tablespoon Dijon mustard
- ½ teaspoon onion powder
- ¼ teaspoon kosher salt
- 1 teaspoon poppy seeds
Instructions
- Preheat the oven to 350 degrees. Thinly slice two sweet onions. Warm a tablespoon of olive oil in a skillet over medium low heat. Add the onions and slowly cook until they are soft and change to a golden color, about 45 minutes.
- Add prepared horseradish sauce, mayonnaise and Dijon mustard to a small bowl and whisk until smooth. Season with salt and pepper to taste.
- Melt the butter in a small saucepan, then stir in the Worcestershire sauce, Dijon mustard, onion powder, and salt. Simmer on low heat for 5 minutes.
- Place the bottom halves of the slider buns cut side up in two square 9 inch baking dishes. Evenly spread the aioli on the buns.
- Layer 2 thin slices of roast beef on each bun and top with cheese slices and caramelized onions. Lay on the top buns and pour the butter sauce all over, allowing it to drip between the buns and over the sides.
- Sprinkle the top of the sliders with poppy seeds for a little crunch.Cover the sliders with aluminum foil and bake in a 350 degree oven for 20 minutes.
- Remove the foil and bake another 10 minutes, until the buns are browned and the cheese is melted.
Notes
- The original King's Hawaiian sweet rolls sold in 12-count packages may be used in place of the slider buns. If you use these rolls, you'll need to slice them in half horizontally and bake in a 9×13 inch baking dish.
- To freeze sliders, make up the sandwiches as directed, but leave off the butter sauce. Wrap in aluminum foil and store in a Ziploc freezer bag for up to 2 months. When ready to serve, thaw in the refrigerator overnight. Add the butter sauce to the tops and bake.
Nutrition
Life Love and Good Food does not claim to be a registered dietician or nutritionist. Nutritional information shared on this site is only an estimate. We recommend running the ingredients through an online nutritional calculator if you need to verify any information.
These sliders are so yummy. I have made them many times for parties or just for dinner.
Yay! Thank you, Jane, for your feedback