Savory Vegetarian Hawaiian Roll Sliders

If you ask me, slider parties are one of the best ways to feed a crowd.

These vegetarian Hawaiian roll sliders pack in serious flavor with marinated portobello mushrooms that taste almost meaty. The mushrooms soak up a simple balsamic and soy marinade with garlic and rosemary, then get piled onto sweet rolls with melted sharp cheddar.

The combination of savory mushrooms and sweet rolls is really something special. Everything bakes together until the cheese gets all melty and the tops turn golden.

They’re perfect for game day, potlucks, or just a casual weeknight dinner when you want something a little different.

What Kind of Portobello Mushrooms Should I Use?

Fresh portobello mushrooms are what you’ll want for these sliders, and you can find them in pretty much any grocery store. Look for mushrooms that are firm with smooth caps and no dark, slimy spots – those are signs they’re past their prime. You can buy them whole and slice them yourself, or grab pre-sliced portobellos to save some prep time. Before cooking, just give them a quick wipe with a damp paper towel to remove any dirt, but don’t rinse them under water since mushrooms absorb moisture like a sponge and can get soggy.

Options for Substitutions

These sliders are pretty adaptable, so here are some swaps you can make:

• Portobello mushrooms: If you’re not a fan of portobellos, try using cremini or baby bella mushrooms instead. They’ll give you a similar meaty texture. You could also use thick-sliced regular button mushrooms in a pinch.
• King’s Hawaiian Rolls: These sweet rolls are really what make these sliders special, so I’d recommend sticking with them if possible. But if you can’t find them, any soft slider buns or dinner rolls will work – just know you’ll miss out on that signature sweet flavor.
• White Sharp Cheddar: Any good melting cheese works here. Try Swiss, provolone, Gruyere, or even regular sharp cheddar. Monterey Jack is another solid option if you want something milder.
• Soy sauce: For a gluten-free version, swap in tamari or coconut aminos. They’ll give you that same savory, umami flavor without the gluten.
• Balsamic vinegar: Red wine vinegar or apple cider vinegar can step in here. You might want to add a tiny pinch of sugar to either one to mimic balsamic’s natural sweetness.

Watch Out for These Mistakes While Baking

The biggest mistake when making these sliders is not draining the mushrooms well enough after cooking, which can make your Hawaiian rolls soggy and fall apart – use a slotted spoon and let excess liquid drip off before placing them on the cheese.

Another common error is skipping the marinating step or rushing it, but even 15 minutes makes a real difference in flavor, so plan ahead if you can.

To prevent the tops from browning too quickly while the cheese is still melting, cover the sliders loosely with foil for the first 10 minutes of baking, then remove it to let them get golden and crispy.

Finally, don’t slice the rolls into individual sandwiches before baking – keeping them connected helps them steam and stay moist, and they’re much easier to cut apart once they’re done.

What to Serve With Hawaiian Roll Sliders?

These sliders are pretty filling on their own, but I love serving them with a simple side salad or some crispy sweet potato fries for a complete meal. If you’re feeding a crowd, a big bowl of tortilla chips with guacamole or salsa makes for easy snacking alongside the sliders. For something lighter, try some pickled vegetables or a cucumber salad to balance out the richness of the cheese and butter. You could also set out some kettle chips or pretzels if you want to keep things super casual and low-effort.

Storage Instructions

Store: These sliders are best enjoyed fresh from the oven while the cheese is still gooey, but leftovers will keep in an airtight container in the fridge for up to 3 days. The rolls might soften a bit as they sit, but they’re still totally delicious.

Freeze: You can freeze these sliders either before or after baking. If freezing unbaked, assemble everything and wrap tightly in foil, then freeze for up to 2 months. For already baked sliders, let them cool completely before wrapping and freezing the same way.

Reheat: Pop refrigerated sliders in a 350°F oven for about 10 minutes until warmed through and the cheese gets melty again. If reheating from frozen, add about 5-10 extra minutes. You can also microwave individual sliders for 30-45 seconds, though the rolls won’t be quite as crispy.

Estimated Nutrition

Estimated nutrition for the whole recipe (without optional ingredients):

• Calories: 1800-2000
• Protein: 55-65 g
• Fat: 75-85 g
• Carbohydrates: 210-230 g

Ingredients

For the mushroom filling:

• 12 oz portobello mushrooms (sliced into 1/4-inch thick pieces)
• 1/4 cup balsamic vinegar
• 3 tbsp soy sauce
• 3 tbsp olive oil
• 1 tsp dried rosemary (crushed)
• 3/4 tsp garlic powder
• 1/2 tsp smoked paprika
• 2 tsp butter

For the assembly:

• 12 King’s Hawaiian sweet rolls (cut in half horizontally)
• 2 1/2 cups sharp cheddar (freshly shredded)
• 1 tbsp fresh parsley (finely chopped for garnish)

Step 1: Prepare the Marinade and Marinate Mushrooms

• 1/4 cup balsamic vinegar
• 3 tbsp soy sauce
• 3 tbsp olive oil
• 1 tsp dried rosemary
• 3/4 tsp garlic powder
• 1/2 tsp smoked paprika
• 12 oz portobello mushrooms

In a shallow dish or resealable bag, whisk together the balsamic vinegar, soy sauce, olive oil, crushed rosemary, garlic powder, and smoked paprika until well combined.

Add the sliced portobello mushrooms and toss to coat evenly, ensuring all pieces are submerged in the marinade.

Let them sit for at least 15 minutes (up to 60 minutes for deeper flavor).

I find that marinating for the full hour really develops a rich, savory depth that makes these sliders memorable.

Step 2: Preheat Oven and Prepare the Rolls

• 12 King’s Hawaiian sweet rolls

Preheat your oven to 350°F.

While it heats, carefully slice each King’s Hawaiian sweet roll in half horizontally.

Arrange the bottom halves on a large baking sheet, cut-side up, leaving a little space between each one so they can heat evenly without steaming.

This is important because it allows the cheese to melt properly without the bread getting soggy.

Step 3: Sauté the Marinated Mushrooms

• 2 tsp butter
• marinated mushrooms from Step 1

Melt the butter in a large skillet over medium-high heat.

Using a slotted spoon, transfer the marinated mushrooms from the marinade into the hot skillet, reserving the liquid.

Sauté for 5-8 minutes, stirring occasionally, until the mushrooms are tender and lightly caramelized.

I typically drain off excess liquid as the mushrooms cook to avoid making the sliders soggy—you want them flavorful but not wet.

Step 4: Build and Bake the Sliders

• 2 1/2 cups sharp cheddar
• sautéed mushrooms from Step 3
• roll tops from Step 2

Divide the shredded cheddar cheese in half.

Sprinkle the first half evenly over the bottom halves of the rolls on the baking sheet.

Top each with a portion of the sautéed mushrooms from Step 3, distributing them evenly across all sliders.

Sprinkle the remaining cheese over the mushrooms, then place the roll tops on each slider.

Bake for 15-20 minutes until the cheese is melted and the rolls are warmed through and lightly toasted.

Step 5: Finish and Serve

• 1 tbsp fresh parsley

Remove the baked sliders from the oven and let them rest for a minute or two.

Arrange them on a serving platter and garnish with fresh parsley.

Serve immediately while the cheese is still melted and the rolls are warm.

Savory Vegetarian Hawaiian Roll Sliders

Delicious Savory Vegetarian Hawaiian Roll Sliders recipe with step-by-step instructions.

Print Recipe Pin Recipe

Prep Time 15 minutes mins

Cook Time 30 minutes mins

Total Time 45 minutes mins

Servings: 12 sliders

Calories: 1900

Ingredients Method

Ingredients

  

For the mushroom filling:

• 12 oz portobello mushrooms (sliced into 1/4-inch thick pieces)
• 1/4 cup balsamic vinegar
• 3 tbsp soy sauce
• 3 tbsp olive oil
• 1 tsp dried rosemary (crushed)
• 3/4 tsp garlic powder
• 1/2 tsp smoked paprika
• 2 tsp butter

For the assembly:

• 12 King's Hawaiian sweet rolls (cut in half horizontally)
• 2 1/2 cups sharp cheddar (freshly shredded)
• 1 tbsp fresh parsley (finely chopped for garnish)

Method

 

1. In a shallow dish or resealable bag, whisk together the balsamic vinegar, soy sauce, olive oil, crushed rosemary, garlic powder, and smoked paprika until well combined. Add the sliced portobello mushrooms and toss to coat evenly, ensuring all pieces are submerged in the marinade. Let them sit for at least 15 minutes (up to 60 minutes for deeper flavor). I find that marinating for the full hour really develops a rich, savory depth that makes these sliders memorable.
2. Preheat your oven to 350°F. While it heats, carefully slice each King's Hawaiian sweet roll in half horizontally. Arrange the bottom halves on a large baking sheet, cut-side up, leaving a little space between each one so they can heat evenly without steaming. This is important because it allows the cheese to melt properly without the bread getting soggy.
3. Melt the butter in a large skillet over medium-high heat. Using a slotted spoon, transfer the marinated mushrooms from the marinade into the hot skillet, reserving the liquid. Sauté for 5-8 minutes, stirring occasionally, until the mushrooms are tender and lightly caramelized. I typically drain off excess liquid as the mushrooms cook to avoid making the sliders soggy—you want them flavorful but not wet.
4. Divide the shredded cheddar cheese in half. Sprinkle the first half evenly over the bottom halves of the rolls on the baking sheet. Top each with a portion of the sautéed mushrooms from Step 3, distributing them evenly across all sliders. Sprinkle the remaining cheese over the mushrooms, then place the roll tops on each slider. Bake for 15-20 minutes until the cheese is melted and the rolls are warmed through and lightly toasted.
5. Remove the baked sliders from the oven and let them rest for a minute or two. Arrange them on a serving platter and garnish with fresh parsley. Serve immediately while the cheese is still melted and the rolls are warm.