These cheesy roast beef sliders are topped with lots of leftover roast beef, Swiss cheese, caramelized onions and a simple horseradish mayo. Always a hit for both dinner or game day!
Just a little while back, I shared a recipe for caramelized onions. So, what did I do with ’em (besides enjoying straight outta the pan??)
I made a delicious beef slider recipe!! Well, beef sliders with caramelized onions, plenty of ooey gooey cheese and a horseradish mayo. Hungry yet?
Hubby and I started making sliders for Halloween. We usually pick between this roast beef slider recipe or vegetarian sliders.
I don’t know why we started having sliders for Halloween, but it’s definitely not a bad idea 😉
And if you’re looking for something to go with these, homemade wedges are always a good choice, if you ask me!
What are Sliders?
Sliders are basically little burgers or sandwiches.
Because they’re little (typically two inches across), if they’re the main course for dinner, then one would typically enjoy a few.
And, forgetting all these technicalities….don’t ya think mini food is the cutest??
How to Make this Beef Slider Recipe
- Buns usually come uncut. For each set of 12 buns, carefully use a knife to cut the buns in half through the middle (so you have a bottom half and top half, leaving individual buns intact).
- Spread horseradish mayo on both bottom and top of each set of buns.
Assemble Roast Beef Sliders
- Distribute leftover roast beef (that has been shredded) over top.
- Now, spread a layer of delicious caramelized onions over beef.
- Layer on cheese slices.
- Place top buns over cheese.
- Brush buns with a little melted garlic butter.
- Cover with foil and bake (part-way through, remove foil).
- Once shredded beef sliders are heated through and cheese is melted, carefully remove from oven, cut into pieces and enjoy!
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Best Bun to Use For Sliders
Many grocery stores now carry small buns specifically for this purpose.
I picked up ‘brioche’ buns, but choose whatever variety you like best.
Can’t find slider buns? Use dinner rolls! If there’s too much bread, just cut out some of the centre so you have a thinner top and bottom. Easy peasy!
Can I Use Store Bought Beef Instead?
Absolutely! Just go to your grocery deli and ask them to cut some off for you!
‘Shaved’ roast beef from your deli works great here too.
If you’re looking for some delicious ways to cook roast beef, here are some faves –
- Tender Oven-Braised Pot Roast from Sweet Tea and Thyme – This oven braised roast is melt in your mouth delicious.
- Worcestershire Butter Roast Beef from Rock Recipes – Lots of butter and savoury Worcestershire sauce make this one super flavourful.
- Slow Cooker Chuck Roast from Sunday Supper Movement – With lots of fresh herbs, this is such a classic preparation.
- Instant Pot Pot Roast from Fantabulosity – This recipe cooks a roast from frozen in your Instant Pot.
Can I Make These Sliders Ahead of Time?
If your leftover roast beef is still fresh, you sure can!
Make ahead of time, cover well and refrigerate up to a day ahead (don’t brush garlic butter on ’em until you are ready to bake).
You may need to bake them a tad longer to heat them through and get the cheese all melty.
How to Make Horseradish Mayo
All that’s needed for this horseradish mayo is horseradish, mayo and a pinch each of salt and pepper.
Use as little or as much horseradish as you like, depending on your preference.
Tip: Place horseradish in a paper towel or clean tea towel and squeeze excess moisture outta there so you don’t water down the mayo.
Not into horseradish mayo? Mix things up! Add either hot sauce, bbq sauce or Dijon mustard to mayo instead…or just have the mayo as is. Either works wonderful with these pulled beef sliders!
More Tips & Variations
Don’t have garlic butter on hand? Infuse some butter with minced garlic and heat up to get that garlic goin’. Not a fan of garlic? Use regular ol’ butter!
Swiss cheese was used here, but you could use your favourite melty cheese. Cheddar, mozzarella or gouda would also be delicious options.
Don’t have caramelized onions on hand or don’t have time to make them? Try fried onions instead. They’re quicker to prepare and you’ll still get an onion flavour!
Add some texture! Sprinkle some sesame seeds or poppy seeds onto those buttered buns before baking.
If you have leftover au jus from your roast beef dinner, warm that up and serve alongside so they’re like french dip sliders!
These are beef sliders for a crowd (hello weekend get together), but you could easily half the recipe if you prefer.
More Cheesy Recipes You May Enjoy
- Cheesy Ground Beef Quesadillas – Made in minutes, these quesadillas are beefy, cheesy and straight up comfort food.
- Chicken & Cheese Quesadillas – With plenty of chicken, cheese, black beans and hot peppers, this quesadilla recipe is always a winner.
- Ground Turkey Quesadillas – Ground turkey, black beans and cheese..what’s not to love?
- Refried Bean Quesadillas – With homemade refried beans, lots of cheese and chips, these are always a hit.
- Pizza Grilled Cheese – All the flavours of pizza in a grilled cheese sandwich? Oh yeah…this one is delicious!
Hope you love this easy beef slider recipe as much as we do!
Until next time, take care and chit chat again soon,
Make these beef sliders? That’s awesome! Love it if you left a comment below. Many thanks!
Cheesy Roast Beef Sliders (with caramelized onions)
- 24 mini slider buns (I used 'brioche')
- 2 pounds cooked roast beef , shredded or roughly chopped (about 5.5 to 6 cups)
- 1 cup caramelized onions (or use fried, if you like)
- 320 grams Swiss cheese , shredded (or about 12 ounces or 3.5 to 4 cups or use 12 slices)
- 2 to 3 tablespoons garlic butter , melted
- 1 cup light mayo
- 6 to 8 tablespoons horseradish , squeezed of excess moisture (use less if you want less of a horseradish flavour)
- pinch black pepper
- pinch salt
- Carefully cut buns in a half (horizontally so you have a bottom portion and top portion (and leave individual buns intact)). Preheat oven to 350 degrees Fahrenheit.Note: This recipe makes about 24 sliders. You can easily half the recipe if you like. Also, if you pile on less (or more) toppings onto your buns, the quantity you yield may vary.
- Spread horseradish mayo over insides of buns. Place bottom buns in a baking dish (use two baking dishes (one for each set of 12 buns)).
- Distribute beef over buns. Top with caramelized onions and cheese. Then, place top buns over top.
- Cover with foil and bake in preheated oven for 15 minutes. Carefully remove foil and bake another 5 minutes or so or until cheese is melted and sliders are heated through.
- Squeeze excess moisture from horseradish via a sieve or using a clean tea towel. This helps prevent your mayo from being watered down.
- Then, combine all ingredients in a bowl, stirring well to combine. Note: Add a tablespoon or so of horseradish at a time until you've reached your desired flavour.
- Prep time does not include caramelizing onions. If you are including those and do not already have on hand, they take about 60 minutes to prepare.
- Don’t have garlic butter on hand? Infuse some butter with minced garlic and heat up to get that garlic goin’. Not a fan of garlic? Use regular ol’ butter!
- Swiss cheese was used here, but you could use your favourite melty cheese. Cheddar, mozzarella or gouda would also be delicious options.
- Don’t have caramelized onions on hand or don’t have time to make them? Try fried onions instead. They’re quicker to prepare and you’ll still get an onion flavour!
- Add some texture! Sprinkle some sesame seeds or poppy seeds onto those buttered buns before baking.
- If you have leftover au jus from your roast beef dinner, warm that up and serve alongside so they’re like french dip sliders!
- These are beef sliders for a crowd (hello weekend get together), but you could easily half the recipe if you prefer.
- More recipe tips in body of post above.