Corned Beef Swiss Sliders

The smell of butter and poppy seeds drifting from the oven still takes me back to my friend Jamie's apartment, where we first made these for a spontaneous game night. We were running late and grabbed whatever was at the grocery store, but something magical happened when that garlic butter hit the hot buns. Now they're my go-to whenever I need to feed a crowd without spending hours in the kitchen.

Last winter, my neighbor texted at 4 PM saying her family was unexpectedly in town and she had zero appetizers ready. I brought over a tray of these warm from the oven, and her brother-in-law literally asked if he could take the leftovers home. There were no leftovers.

Ingredients

• Sliced corned beef: Thin slices work best here, and I've learned that asking the deli counter to slice it slightly thicker than sandwich meat gives you better texture
• Swiss cheese: The nutty, mild flavor complements the salty beef perfectly without overwhelming everything else
• Slider buns: Hawaiian sweet rolls add a subtle sweetness that balances the savory elements, but brioche works beautifully too
• Dill pickle slices: One slice per slider adds just the right amount of crunch and tang to cut through all that richness
• Dijon mustard and mayonnaise: This simple combo creates a creamy, tangy spread that keeps everything from getting too heavy
• Red onion: Thinly sliced onion adds a sharp bite and texture contrast, though it's totally optional if you're not an onion person
• Unsalted butter: Melted butter helps the toppings stick and creates that gorgeous golden color we're all after
• Garlic powder: Garlic powder distributes more evenly than fresh garlic in this butter mixture
• Poppy seeds: These add a subtle crunch and that classic deli sandwich flavor profile
• Dried onion flakes: They rehydrate slightly in the butter and add little bursts of onion flavor throughout

Instructions

Get your oven ready:

Preheat to 180°C 350°F and line a baking sheet with parchment paper, which saves you from scrubbing melted cheese off metal later

Prep the buns:

Slice all the slider buns in half horizontally and arrange just the bottom halves on your prepared baking sheet like a little bun army

Make the sauce:

Whisk together the Dijon mustard and mayonnaise in a small bowl until it's a unified creamy mixture

Spread it on:

Generously spread that mustard-mayo mixture over the cut sides of all the bottom buns, making sure every inch gets some love

Layer the fillings:

Pile on sliced corned beef, top with Swiss cheese, add a pickle slice, and scatter some red onion rings if you're using them

Put the tops on:

Place the bun tops over everything like little blankets, making sure they're aligned with their bottom halves

Whisk up the magic butter:

Combine the melted butter with garlic powder, poppy seeds, and onion flakes in another small bowl

Butter the tops:

Brush that butter mixture generously over all the bun tops, letting it soak in a bit and catching any drips of the seeds

Bake with the foil trick:

Cover loosely with aluminum foil and bake for 8 minutes, then uncover and bake 2-3 more minutes until cheese is melty and tops are golden

Save to Pinterest

My cousin's teenage son, who survives on chicken nuggets and indifference, ate four of these at our family reunion and asked if I could 'teach him how to make the good ones.' That's when I knew these sliders had crossed from appetizer territory into core memory territory.

Make Ahead Magic

You can assemble the entire tray up to 4 hours before baking, just wrap it tightly in plastic and keep it in the fridge. Add the butter mixture right before they go into the oven, or the buns will get weirdly soggy from sitting in all that moisture.

Serving Strategy

These are perfect for setting out buffet style because they hold their temperature surprisingly well. I've found that cutting them apart immediately after baking makes them easier to grab, but keeping them connected helps everything stay warm longer.

Flavor Variations

Try Russian dressing instead of the mustard-mayo mix for a Reuben vibe, or add a layer of sauerkraut if you want that classic deli flavor profile. For spice lovers, a thin slice of jalapeño tucked under the cheese adds a kick that wakes everything up.

• Mix everything but the butter mixture the night before for faster assembly
• Keep extra poppy seeds on hand because the topping mixture goes faster than you expect
• Double the recipe because you will regret making only one batch

Save to Pinterest

There's something universally satisfying about a warm, melty slider that makes people gather around the kitchen island. Hope these bring as much joy to your table as they've brought to mine.

Recipe Questions & Answers

→ What bread is best for these sliders?

Soft slider buns like Hawaiian or brioche work best to complement the savory beef and melty cheese without overpowering the flavors.

→ Can I prepare these sliders ahead of time?

Yes, you can assemble them and keep covered in the fridge for a few hours before baking to save time.

→ What gives the sliders their golden top?

A buttery mixture with garlic powder and poppy seeds brushed on top creates a flavorful golden crust when baked.

→ Are there options for extra tanginess?

Adding sauerkraut or swapping the mustard-mayo spread for Russian dressing introduces additional tang and depth.

→ How can I add a spicy kick to these sliders?

Include a slice of jalapeño on each slider to introduce a spicy and fresh heat contrast.