These Roast Beef Sliders got that cozy deli-shop smell, the gooey Swiss cheese pull, and the little kick from the horseradish mayo that honestly makes me smile every time. The crispy onions melt right into the cheese and give the whole thing a crunchy surprise.
These sliders pair so well with a fresh salad. If you have roast beef left try my Roast Beef salad, And if you love easy party-style recipes, my Hawaiian Roll Garlic Cheese Bread always gets devoured first.
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The ingredients
Horseradish Mayo
- Mayonnaise
Makes everything creamy and ties the slider filling together. - Prepared horseradish
Adds heat and brightness. Start small, add more if you like spicy things. - Salt and pepper
Just enough to balance the sauce.
Beef Sliders
- Mini slider buns
Any soft buns work. Hawaiian-style rolls stay the softest. - Cooked roast beef
Shredded or chopped. Deli slices are fine too. - Swiss cheese
Mild, melty, and perfect with horseradish. - Crispy onions
Little pockets of crunch. Don't skip them.
For the ingredients quantities go to the recipe card below
Steps-by-step Instructions for the Roast Beef Sliders
1. Make the horseradish mayo
Stir together the mayo, horseradish, salt, and pepper.
Taste and add more horseradish if you want extra kick.
Set it aside.
2. Prep the slider buns
Preheat your oven to 350ยฐF.
Slice the buns horizontally, keeping them connected like a sheet.
Place the bottom layer in a baking dish.
3. Layer the roast beef
Spread the horseradish mayo evenly.
Scatter the roast beef over the buns.
4. Add cheese and onions
Sprinkle the Swiss cheese all over the top.
Add the crispy onions for texture.
5. Add the top buns
Place the top half back on gently.
6. Bake
Bake for 10 minutes or until the cheese is nice and melty.
7. Serve warm
Slice into individual sliders and serve right away.
Sophie Tips
- If you want a golden glossy top, brush a bit of butter on the buns before baking.
- Add a few pickles on top of the roast beef for extra tang.
- If your roast beef is thick, warm it up slightly before layering so the sliders bake evenly.
- I always double this recipe because apparently sliders disappear faster than air in my house.
Variations
- Swap Swiss for provolone or cheddar for a cheesier vibe.
- Add caramelized onions instead of crispy ones for a softer bite.
- Stir a little Dijon into the horseradish mayo if you love more punch.
- Use turkey or ham instead of roast beef. Still delicious.
Serving Ideas
- Serve with a bowl of tomato soup.
- Add a simple green salad to balance the richness.
- These make a great game-day snack or weeknight dinner.
Storage Tips
You can freeze them, but the crispy onions lose their crunch. Still tasty though.
Store leftovers in the fridge for up to 3 days.
Reheat at 325ยฐF for about 10 minutes so the bread stays soft.
FAQ
Yes, prep everything except the baking. Add the crispy onions right before the oven so they stay crunchy.
Spread the mayo thinly and bake uncovered so the buns warm through without steaming.
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Roast Beef Sliders
Equipment
- Baking dish
- Serrated knife
- Mixing bowl
- Measuring cups
- Cutting board
Ingredients
Horseradish Mayo
- 1 tablespoon prepared horseradish
- ยฝ cup mayonnaise
- Salt and pepper to taste
Beef Sliders
- 12 mini slider buns
- 1 pound cooked roast beef shredded or chopped
- ยฝ cup crispy onions
- 1 cup Swiss cheese shredded
Instructions
- In a bowl, combine the mayonnaise, horseradish, salt, and pepper until smooth. Taste and adjust the seasoning.
- Preheat the oven to 350ยฐF. Slice the slider buns horizontally without separating them. Place the bottom section into a baking dish.
- Spread the mayo mixture all over the bottom buns. Add the roast beef on top, spreading it out evenly.
- Sprinkle the shredded Swiss cheese over the beef, then add the crispy onions.
- Place the top buns back on.
- Bake for about 10 minutes, or until the cheese melts.
- Slice into sliders and serve warm.
Notes
- For extra spice, stir in a bit of Dijon mustard.
- You can swap Swiss cheese for cheddar or provolone.
- Hawaiian rolls stay the softest when baked.
- Reheat leftovers at a low temperature so the bread doesn't dry out.
Sophie Viau says
These roast beef sliders are one of my go-tos for game day. I swear every time I set the tray down, they vanish before I even grab my own plate.