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. Besides enjoying them straight out of the pan, what did I do with them?
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 sloppy joe sliders.
Random, right?
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 potato wedges are always a good choice!
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
Full details are in the recipe card below, but here are the basics:
- 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 the bottom portion and top portion of buns. Place in a baking dish.
- Distribute roast beef (that has been shredded) over top of buns.
- 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 aluminum foil and bake (partway through, remove foil).
- Once the shredded beef sliders are heated through and the cheese is melted, carefully remove them from the oven, cut into individual sliders and serve.
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!
Can I Use Store Bought Beef Instead?
Absolutely!
Aide from preparing roast beef at home, you can totally use store-bought cooked roast beef instead. Just go to your grocery deli and ask them to cut some off for you! Shaved or sliced deli roast beef works great.
How To Make Horseradish Mayo
All that’s needed for this horseradish mayo is horseradish, mayonnaise and a pinch each of salt and pepper.
Use as little or as much horseradish as you like, depending on your preference.
Tip: Squeeze out any excess moisture from the horseradish so you don’t water down the mayo.
You basically mix the ingredients together in a bowl until combined and use on these sliders.
Not into horseradish mayo? Mix things up! Add either hot sauce, BBQ sauce or Dijon mustard to the mayonnaise instead. Or just have the mayonnaise as is. Either works wonderfully with these pulled beef sliders!
Tips and Variations
- These are beef sliders for a crowd, but you could easily half the recipe if you prefer.
- Don’t have garlic butter on hand? Infuse some butter with minced garlic and heat up to get that garlic going. Not a fan of garlic? Use regular 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, heat that up and serve alongside so they’re like French dip sliders!
More Cheesy Recipes
- Cheesy Ground Beef Quesadillas
- Cheesy Chicken Quesadillas
- Cheesy Ground Turkey Quesadillas
- Refried Bean Quesadillas
- Pizza Grilled Cheese
If you make this beef slider recipe, be sure to leave a comment below!
Cheesy Roast Beef Sliders With Caramelized Onions
Ingredients
Beef Sliders
- 18 to 24 mini slider buns, brioche buns are great here
- 2 pounds cooked roast beef, shredded or roughly chopped (about 5.5 to 6 cups)
- 1 to 1.5 cups caramelized onions, depending on how much onion flavour you want (or you can use fried onions, if you like)
- 12 ounces Swiss cheese, slices (or 3 cups shredded Swiss cheese)
- 2 to 3 tablespoons garlic butter, melted
Horseradish Mayo
- 1 cup mayonnaise
- 6 to 8 tablespoons prepared horseradish, squeezed of excess moisture (use less if you want less of a horseradish flavour)
- pinch freshly ground black pepper
- pinch salt
Instructions
Beef Sliders
- 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 18 to 24 sliders (depending on how much toppings you want on them). Also, if you pile on less (or more) toppings onto your buns, the quantity you yield may vary. You can easily half the recipe if you like.
- Spread horseradish mayo over insides of buns. Place bottom buns in a baking dish large enough to hold the buns (use two baking dishes if needed, one for each set of 12 buns).
- Distribute cooked roast beef over buns. Top with caramelized onions and cheese. Then place top buns over top. Brush with melted garlic butter.
- Cover with aluminum foil and bake in preheated oven for 15 minutes. Carefully remove aluminum foil and bake another 5 minutes or so or until cheese is melted and sliders are heated through.
- Cut out the individual sliders, serve and enjoy!
Horseradish Mayo
- Squeeze excess moisture from horseradish via a fine-mesh sieve or using a clean tea towel. This helps prevent your mayo from being watered down.
- In a bowl, whisk together the light mayonnaise, prepared horseradish, black pepper and salt together until well combined. Note: Add a tablespoon or so of horseradish at a time until you've reached your desired flavour.
Notes
- 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.
- These are beef sliders for a crowd, but you could easily half the recipe if you prefer.
- 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, heat that up and serve alongside so they’re like French dip sliders!
Nutrition estimate (if provided) is based on 1 Serving.
Nutrition information (if provided) is provided as a courtesy and should be considered an estimate only. Ingredients can vary and Girl Heart Food makes no guarantees to the accuracy of this information. It should not be considered a substitute for a professional nutritionist’s advice.
A note on times provided: appliances vary, any prep and/or cook times provided are guidelines only.
Tried this recipe?
If you do make this recipe, thank you!! It would mean so much if you could leave a comment below. Love to know how you enjoyed it, and it helps other readers too!
