Corned Beef Sliders Mustard

My brother-in-law brought these to a Super Bowl party years ago and I honestly stood by the platter until they were gone, pretending to help serve while steadily eating my way through half the batch. Something about that combination of salty corned beef, sharp mustard, and sweet butter-brushed buns just hits differently when you are crowded around a television with friends and everyone is reaching for the same plate.

Last winter my neighbor came over during a snowstorm with nothing but a package of corned beef and some buns, so we improvised with whatever cheese I had in the fridge. We ended up eating them standing at the counter while watching the snow pile up, agreeing that this accidental combination was better than most meals we had actually planned.

Ingredients

• 400 g (14 oz) cooked corned beef, thinly sliced: Ask your deli counter to slice it paper-thin, or use leftover corned beef from a boiled dinner
• 8 slider buns: Soft Hawaiian sweet rolls work beautifully here, but any mini sandwich bun will do
• 8 slices Swiss cheese: Provolone or sharp cheddar make excellent substitutes if Swiss is not your thing
• 4 tbsp stone ground mustard: The grainy texture is what makes these special, so do not swap for plain yellow mustard
• 2 tbsp mayonnaise: Cuts the sharpness just a bit and adds creaminess to the mustard spread
• 1 cup shredded green cabbage or sauerkraut: Sauerkraut adds that classic Reuben vibe, but fresh cabbage keeps it lighter
• 1 small red onion, thinly sliced: Optional, but adds a nice crunch and color contrast
• 2 tbsp unsalted butter, melted: Brushing the tops with butter gives them that golden, glossy finish
• 1 tsp poppy seeds: Makes them look professionally done and adds a subtle nuttiness
• Freshly ground black pepper: A generous grinding over the layers brings everything together

Instructions

Preheat and prep:

Heat your oven to 180°C (350°F) and line a baking sheet with parchment paper to catch any cheese drips

Assemble the foundation:

Arrange the bottom halves of your slider buns on the prepared baking sheet, then layer each with thin slices of corned beef followed by a slice of Swiss cheese

Make the mustard spread:

Mix the stone ground mustard with mayonnaise in a small bowl until combined, then spread this mixture on the inside of each bun top

Add the crunch:

Scatter shredded cabbage or sauerkraut over the cheese layer, add red onion slices if you are using them, then place the bun tops on the sliders

Butter and seed:

Brush melted butter generously over the bun tops and sprinkle with poppy seeds and black pepper

Bake until golden:

Bake for 8 to 10 minutes until the cheese has melted completely and the bun tops are golden brown

Serve warm:

Let them cool for just a couple of minutes so the cheese sets slightly, then serve while still warm

Save

My daughter now requests these for every birthday celebration instead of cake, and I have honestly stopped fighting it because watching her carefully assemble her own personalized slider has become its own kind of tradition. Food that makes people this happy deserves to be the main event.

Make Ahead Magic

You can assemble these sliders completely up to a day in advance, wrap the baking sheet tightly with foil, and store them in the refrigerator. Just add a couple of extra minutes to the baking time since they will be cold from the fridge, and brush with the butter right before they go into the oven.

Cheese Choices

Swiss cheese is traditional here but I have made these with sharp cheddar for extra flavor, provolone for milder days, and even pepper jack when I wanted some heat. Just remember that stronger cheeses need less mustard to balance the flavors.

Serving Suggestions

These disappear fastest when served alongside something crisp and cool to cut through the richness. A simple pickle plate works beautifully, or you could go with a light green salad dressed with vinaigrette.

• Stack them on a wooden cutting board for casual party vibes
• Provide small napkins because the melted cheese will be messy
• Consider doubling the recipe because they go faster than you expect

Save

There is something deeply satisfying about food you can eat with one hand while holding a drink in the other, and these sliders hit that sweet spot every single time.

Recipe FAQs

→ What type of cheese works best in these sliders?

Swiss cheese melts nicely and complements the corned beef's flavor, but provolone or cheddar can be used for a different taste.

→ Can I prepare the sliders ahead of time?

Yes, assemble the sliders and refrigerate them. Bake just before serving to ensure the cheese melts perfectly and buns stay fresh.

→ What are good condiments to pair with these sliders?

Stone ground mustard provides tang and depth, while mayonnaise adds creaminess. Adding horseradish offers an extra zing.

→ Are there vegetable options to enhance the flavor?

Shredded green cabbage or sauerkraut adds crunch and acidity, while thinly sliced red onion contributes subtle sharpness.

→ How do I achieve a golden, crisp top on the sliders?

Brush the bun tops with melted butter and sprinkle poppy seeds before baking to create a golden, flavorful crust.