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Savory Vegetarian Hawaiian Roll Sliders

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Marinated portobello mushrooms and sharp cheddar come together on soft, slightly sweet King's Hawaiian rolls for a vegetarian slider that's packed with umami flavor. The mushrooms soak up a balsamic, soy sauce, and rosemary marinade before being sautéed until tender and caramelized, then layered between two blankets of melted cheese. Perfect for game days, potlucks, or casual dinners when you want something satisfying without a lot of fuss.
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Prep Time 15 minutes
Cook Time 30 minutes
Total Time 45 minutes
Servings: 12 sliders
Course: Appetizer, Main Course, Snack
Cuisine: American
Ingredients Equipment Method Notes

Ingredients
  

For the Mushroom Marinade
  • 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
For the Sliders
  • 2 tsp butter
  • 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

Equipment

  • Large baking sheet
  • Large skillet
  • Shallow dish or resealable bag
  • Slotted spoon

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 combined. Add the sliced portobello mushrooms and toss until every piece is evenly coated. Allow the mushrooms to marinate for at least 15 minutes, or up to 60 minutes for a deeper, richer flavor.
  2. Preheat your oven to 350°F. While it heats up, slice the Hawaiian rolls in half horizontally. Place the bottom halves cut-side up on a large baking sheet, spacing them slightly apart so they heat evenly without steaming together.
  3. Melt the butter in a large skillet over medium-high heat. Using a slotted spoon, transfer the mushrooms from the marinade into the skillet, leaving the liquid behind. Sauté for 5–8 minutes, stirring occasionally, until the mushrooms are tender and have developed lightly caramelized edges. Drain off any excess liquid that accumulates in the pan to keep the sliders from turning soggy.
  4. Divide the shredded cheddar into two equal portions. Sprinkle the first half evenly over all the bottom halves of the rolls on the baking sheet. Distribute the sautéed mushrooms evenly on top of the cheese, then sprinkle the remaining cheddar over the mushrooms. Set the roll tops in place over each slider.
  5. Bake for 15–20 minutes, until the cheese is fully melted and the rolls are warmed through and lightly toasted. Remove from the oven and let the sliders rest for a minute or two. Transfer to a serving platter, garnish with the fresh parsley, and serve immediately while still warm.

Notes

For the best flavor, marinate the mushrooms for the full 60 minutes — the longer soak gives the balsamic and soy sauce time to penetrate deeply and create a richer, more savory result. Always shred your own cheddar rather than using pre-shredded; it melts more smoothly because it lacks the anti-caking starches that can make bagged shredded cheese clumpy. Be sure to drain the sautéed mushrooms well before assembling, as any excess liquid will soak into the rolls and make them soggy. Leftover sliders can be refrigerated in an airtight container for up to three days; reheat wrapped in foil in a 300°F oven for about 10 minutes. To get ahead, marinate and sauté the mushrooms up to a day in advance and refrigerate them, then assemble and bake fresh right before serving.

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