Sliders with Grilled Portobello Mushrooms

Name: Sliders with Grilled Portobello Mushrooms
Prep time: 15 min
Cook time: 10 min
Total time: 25 min
Yield: 4 servings
Ingredients: 4 large Portobello mushrooms, cleaned and stems removed; 4 slider buns; 1 avocado, sliced; Sriracha mayo (to taste); Salt and pepper to taste; Olive oil for grilling

Highlighted under: Inspired Meals

I absolutely love making sliders with grilled Portobello mushrooms! There’s something magical about the umami flavor of the mushrooms combined with the crispiness of the slider buns. The process is simple yet rewarding, and I enjoy experimenting with various toppings and sauces. Every bite is a delightful mix of textures and tastes that never fails to impress at gatherings. Whether it’s a casual get-together or a backyard barbecue, these sliders are a guaranteed hit that friends and family adore.

Created by

Xenia Radcliffe

Last updated on 2026-01-05T20:02:34.746Z

Every time I make sliders with grilled Portobello mushrooms, it reminds me of that summer barbecue at my friend's house. We were experimenting with vegetarian options, and these sliders were a hit! We marinated the mushrooms to enhance their flavor, which took them to a whole new level. They turned out juicy and flavorful, making it hard to believe they were meatless!

A tip I discovered is to allow the mushrooms to rest after grilling. This helps to lock in their juices, making each slider deliciously moist. Pairing them with avocado and sriracha mayo adds an extra layer of flavor you'll surely love!

        Why You Will Love This Recipe
        Juicy, umami-packed Portobello mushrooms that satisfy every craving
Quick and easy preparation — perfect for any occasion
Versatile toppings that let you customize to your taste

      

Grilling Perfection

To achieve the perfect grilled Portobello mushroom, it’s essential to maintain a steady medium heat throughout the grilling process. This allows the mushrooms to cook evenly without becoming tough or charred. Keep an eye on them, flipping only once at the five-minute mark for that ideal tenderness and smoky flavor. If you notice any flare-ups from the oil, simply move the mushrooms to a cooler part of the grill for a moment to prevent burning.

Brushing the mushrooms with olive oil not only enhances their flavor but also creates a barrier that helps lock in moisture while providing a nice sear. If you're looking for additional depth, consider infusing the olive oil with garlic or herbs beforehand. This simple trick elevates the umami notes, making for an even more flavorful bite when combined with the Sriracha mayo.

Customizable Toppings

One of the great joys of making these sliders is the variety of toppings you can choose from. While avocado and Sriracha mayo create a creamy and spicy base, feel free to experiment with crispy fried onions, fresh tomato slices, or even a slice of cheese for added richness. If you want to please various palates, keep a variety of toppings on the table and let everyone create their own perfect slider.

For a healthier twist, consider adding leafy greens like arugula or spinach instead of high-calorie toppings. They add a fresh, peppery flavor that complements the mushrooms beautifully. You can also use gluten-free slider buns or lettuce wraps to accommodate different dietary needs without sacrificing taste.

Ingredients

For the sliders

4 large Portobello mushrooms, cleaned and stems removed
4 slider buns
1 avocado, sliced
Sriracha mayo (to taste)
Salt and pepper to taste
Olive oil for grilling

Instructions

Prepare the mushrooms

Preheat your grill to medium heat. Brush the Portobello mushrooms with olive oil and season with salt and pepper.

Grill the mushrooms

Place the mushrooms on the grill, gill side down. Grill for about 5 minutes, then flip and grill for another 5 minutes until tender.

Assemble the sliders

Toast the slider buns lightly. On each bottom bun, place a grilled mushroom, a few slices of avocado, and drizzle with Sriracha mayo. Top with the bun lids.

Pro Tips

For added flavor, marinate the Portobello mushrooms in balsamic vinegar or your favorite marinade for 30 minutes before grilling.

Make-Ahead Tips

If you're planning a gathering, consider marinating the Portobello mushrooms a few hours in advance. A simple mixture of olive oil, balsamic vinegar, and your favorite herbs will deepen the flavor. Store them covered in the fridge until ready to grill, allowing for a much richer umami flavor that will stand out in each slider.

Assembled sliders can lose their freshness, so it's best to keep the components separate until serving. However, you can prepare the Sriracha mayo and sliced avocado beforehand. Just make sure to toss the avocado with a bit of lemon juice to prevent browning.

Storage and Reheating

Leftover grilled Portobello mushrooms can be refrigerated in an airtight container for up to three days. To keep the texture as close to fresh as possible, reheat them in a skillet over medium heat for a few minutes or until warmed through, rather than microwaving, as that can make them soggy.

If you’ve grilled a larger batch, consider slicing the mushrooms and incorporating them into a salad or pasta dish later in the week, turning them into a versatile ingredient. Their smoky flavor pairs well with a variety of dishes, enhancing your meals without much extra effort.

Questions About Recipes

→ Can I make these sliders ahead of time?

Yes! You can grill the mushrooms and prepare the toppings in advance. Just assemble the sliders when ready to serve.

→ Are these sliders gluten-free?

You can make them gluten-free by using gluten-free slider buns.

→ What other toppings work well?

Feel free to try cheese, grilled onions, or fresh herbs like basil for added flavor.

→ Can I use other mushrooms?

Absolutely! Other large mushrooms such as portabellini or king oyster mushrooms can be great substitutes.