Corned Beef Sliders Swiss Cheese

My brother-in-law brought these to a Super Bowl party years ago, and I honestly spent the whole evening hovering near the platter. Something about that buttery, poppy-seed topping gets into your kitchen and makes everyone wander in asking what smells so incredible.

Last winter my daughter had friends over for a movie marathon, and I put a tray of these in the oven during the opening credits. By the time the second movie started, every single slider was gone, and three teenagers were asking if I had any more hidden in the kitchen.

Ingredients

• 500 g (1.1 lb) sliced corned beef: Ask at the deli counter for thin slices, they melt into the cheese better than thick cuts
• 12 slices Swiss cheese: Provolone works beautifully too if Swiss isnt your thing
• 12 slider buns: Hawaiian rolls add a subtle sweetness that balances the salty beef perfectly
• 12 slices dill pickle: These add the crunch and tang that cuts through all that rich cheese
• 2 tablespoons Dijon mustard: The sharpness here is essential for cutting through the meat and cheese
• 2 tablespoons mayonnaise: Creates that creamy base that holds everything together
• 1 small red onion: Thinly sliced, these add a little bite and texture contrast
• 4 tablespoons unsalted butter, melted: Salted butter works too, just taste the mixture before brushing
• 1 teaspoon garlic powder: Dont use fresh garlic here, it burns too quickly under the broiler
• 1 teaspoon poppy seeds: This is the classic diner flavor that makes people say whats in that butter
• 1 teaspoon dried onion flakes: Optional but adds that extra layer of savory goodness

Instructions

Get your oven ready:

Preheat to 180°C (350°F) and line a baking sheet with parchment paper so cleanup is effortless later.

Prep the buns:

Slice your slider buns horizontally and place just the bottom halves on your prepared baking sheet, keeping them close together so they bake up like one cohesive unit.

Make the sauce:

Whisk together the Dijon mustard and mayonnaise in a small bowl until completely smooth, then spread this mixture generously over the cut sides of all the bottom buns.

Layer everything:

Pile corned beef onto each sauced bun bottom, top with Swiss cheese, add a pickle slice, and scatter some red onion rings if you want that extra kick.

Close them up:

Nestle the top bun halves over all those fillings, pressing down gently so everything settles into place.

Whisk the magic butter:

Combine melted butter with garlic powder, poppy seeds, and onion flakes in another small bowl, stirring until the seeds and flakes are evenly distributed.

Brush generously:

Paint that butter mixture over the tops of all the buns, really soaking them because this creates that golden, flavorful crust everyone fights over.

Bake covered first:

Tent the whole tray loosely with aluminum foil and bake for 8 minutes, which steams the beef and melts the cheese without burning the tops.

Get them golden:

Remove the foil and bake for another 2 to 3 minutes until the cheese is bubbling and those buttered bun tops are turning golden brown.

Serve immediately:

Let them sit for just 2 minutes so the cheese sets slightly, then watch how fast people grab them.

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My neighbor texted me the next day after I dropped off a few of these sliders, saying her husband kept asking when those little sandwich things were coming back. Now I always keep the ingredients in my fridge for emergency snack deliveries.

Making Ahead

You can assemble these sliders completely, wrap the whole tray tightly in plastic wrap, and refrigerate for up to 8 hours before baking. Just brush them with the butter mixture right before they go into the oven.

Serving Suggestions

Set out a bowl of extra mustard for dipping, maybe some coleslaw on the side, and let people grab two or three. These pair beautifully with potato salad or even just a simple green salad with vinaigrette to cut the richness.

Get Creative

Once you master the basic recipe, try Russian dressing instead of the mustard-mayo mix for a classic Reuben vibe. The butter topping works on any sandwich sliders—ham and cheese, turkey, or even vegetarian versions with roasted vegetables and provolone.

• Add sauerkraut for extra tang and crunch
• Try a little horseradish mixed into the mustard for serious heat lovers
• Hawaiian rolls are worth seeking out for that hint of sweetness

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These sliders have become my go-to for everything from game days to casual weeknight dinners when I want something comforting but not heavy. Something about that buttery, cheesy combination just makes people happy.

Recipe Questions & Answers

→ What bread works best for these sliders?

Soft slider buns such as Hawaiian or brioche provide a tender base that complements the fillings without overpowering them.

→ Can I prepare these sliders ahead of time?

Assemble the sliders and store them covered in the refrigerator. Bake shortly before serving to keep buns soft and cheese melted.

→ How do I achieve a golden, flavorful topping?

Brushing the bun tops with a mixture of melted butter, garlic powder, and poppy seeds before baking adds a rich, savory crust.

→ Are there seasoning variations to try?

Yes, swapping the mustard-mayo spread for Russian dressing or adding sauerkraut layers can bring classic Reuben flavors.

→ Can I customize the fillings?

Yes, adding thin slices of red onion or a jalapeño for heat can enhance flavor and texture.