Corned Beef Sliders Mustard

The smell of butter and poppy seeds drifting from the oven still takes me back to rainy Sunday afternoons when my roommate would whip up these sliders while we watched old movies. Something about that golden, brushed top makes the whole apartment feel cozy. We started making them for game nights and potlucks because they disappear so fast.

I once brought a batch to a friends birthday thinking they would be a small side dish, but people crowded around the platter like it was the main event. Someone asked for the recipe before they even finished their first slider. Now they are my go to whenever I need something that feels special but does not keep me in the kitchen for hours.

Ingredients

• Sliced corned beef: Thinly sliced from the deli counter works best here
• Slider buns or mini rolls: Soft potato buns absorb the butter mixture beautifully
• Swiss cheese: The mild nutty flavor lets the corned beef shine
• Whole-grain mustard: Adds texture and a gentle tangy bite
• Mayonnaise: Optional but creates a creamy contrast to the mustard
• Red onion: Thinly sliced for just a hint of sharpness
• Dill pickle slices: One per slider keeps things from getting too rich
• Unsalted butter: Melted and mixed with seasonings for that golden top
• Dijon mustard: Whisked into the butter for extra depth
• Garlic powder: A subtle savory note in the butter mixture
• Poppy seeds: Optional but adds a pretty finish and subtle crunch

Instructions

Get your oven ready:

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

Prep the buns:

Slice your slider buns in half and arrange the bottom halves on your prepared baking sheet like little soldiers ready for duty.

Layer the goodness:

Pile corned beef onto each bottom bun followed by Swiss cheese, a few onion rings, and a single pickle slice.

Spread the sauce:

Mix whole-grain mustard with mayonnaise if using and spread it on the inside of each top bun.

Assemble the sliders:

Place the tops on the sliders like little hats.

Make the magic butter:

Whisk melted butter with Dijon mustard, garlic powder, and poppy seeds until combined.

Brush and cover:

Generously brush the butter mixture over the bun tops and cover the whole tray loosely with foil.

Bake until golden:

Bake covered for 10 minutes then remove foil and bake 5 more minutes until cheese melts and tops turn beautifully golden.

Serve them up:

Let cool just a couple minutes before serving warm.

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My dad always says the poppy seeds are unnecessary but I have learned they add a subtle nuttiness that makes people ask what the secret ingredient is. These sliders have become my peace offering whenever tensions run high at family gatherings because food solves everything.

Making Them Ahead

You can assemble these sliders up to a day in advance and store them covered in the refrigerator. Just wait to brush the butter mixture on until right before baking.

Cheese Variations

Swiss is traditional but I have used provolone or even a sharp cheddar when that was what I had on hand. The key is something that melts well and complements the mustard.

Serving Suggestions

These sliders work for everything from casual game day snacks to unexpected guests. They are hearty enough to stand alone but a simple coleslaw or potato salad on the side never hurts.

• Cut parchment paper between rows for easy grabbing
• Leave the butter mixture on the table for anyone who wants extra
• Have extra pickles on hand for the pickle lovers

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There is something universally happy about miniature food that makes people smile before they even take a bite. These sliders have that effect every single time.

Common Questions

→ What type of cheese is used in these sliders?

Swiss cheese is halved and layered for meltiness and a mild, nutty flavor that complements the beef.

→ Can the mustard flavor be adjusted?

Yes, whole-grain mustard provides texture and tang, but Dijon mustard in the butter mix adds warmth that can be tweaked to taste.

→ Are there suggested variations for the buns?

Rye slider buns can be used for a classic deli-style touch, adding extra depth to the flavor profile.

→ How can I add extra zest to the sliders?

Adding sauerkraut beneath the cheese introduces a tangy, fermented zing that enhances the overall flavor.

→ What is the best way to serve these sliders?

Serve warm right out of the oven, allowing the cheese to be melted and the butter topping to be golden and flavorful.