Sliders with Grilled Portobello Mushrooms

Highlighted under: No-Fuss Ideas

I love making sliders with grilled portobello mushrooms because they are a delicious and satisfying plant-based option. With their meaty texture and rich flavor, these mushrooms are perfect for a casual gathering or a weeknight dinner. The best part is that they take just 30 minutes to prepare, yet pack a punch in taste. I often serve them with a zesty aioli and fresh toppings for an extra kick, making them a hit with everyone, regardless of whether they're vegetarian or not.

Kendra Lawson

Created by

Kendra Lawson

Last updated on 2026-01-05T18:53:34.952Z

During my first attempt at these sliders, I was amazed at how quickly they came together. The key is to marinate the portobello mushrooms in a mix of olive oil, balsamic vinegar, and garlic for at least 15 minutes. This not only enhances their flavor but also helps in achieving that perfect char on the grill. I served them on toasted buns with avocado and fresh spinach, which added a delightful creaminess and crunch.

Over time, I’ve played around with different toppings and sauces. One of my favorites is a homemade garlic aioli, which complements the mushrooms wonderfully. I remember one evening when friends came over, and these sliders disappeared within minutes. It’s hard to believe something so simple could be such a crowd-pleaser.

Why You'll Love This Recipe

  • Rich umami flavor of grilled portobello mushrooms
  • Easy to customize with your favorite toppings
  • Perfect for family gatherings or casual dinners

Maximizing Flavor with Marinades

Marinating portobello mushrooms is crucial for enhancing their natural umami flavor. The combination of olive oil and balsamic vinegar not only tenderizes the mushrooms but also infuses them with a rich, tangy taste. Allowing them to marinate for a minimum of 15 minutes is a good starting point, but if time permits, you can let them sit for up to an hour in the refrigerator. This additional time will deepen the flavor and create a more satisfying bite, making each slider even more delightful.

If you’re looking to experiment, consider incorporating herbs and spices into your marinade. Fresh rosemary or thyme can complement the earthiness of portobello mushrooms beautifully. For a spicy kick, add a pinch of red pepper flakes or a dash of hot sauce to the marinade. These additions can elevate your sliders and provide a personalized touch, making them even more memorable at gatherings.

Perfecting Your Grill Technique

When grilling portobello mushrooms, maintaining the right temperature is key. A medium-high heat is ideal, typically around 400°F to 450°F. This range ensures that the mushrooms get a nice char without becoming too dry. Watch them closely and flip them once they develop golden grill marks. If the mushrooms feel overly firm while grilling, they may need a little extra time, but avoid overcooking them, as they can become rubbery. Aim for a tender texture that still holds its shape for that perfect slider experience.

After grilling, let the mushrooms rest for a minute before assembling your sliders. Resting allows the juices to redistribute, ensuring a moister bite. If you find that your portobellos release too much liquid during grilling, consider using a grill basket or foil to catch excess juices, adding a smoky flavor without the mess. For those without a grill, broiling the mushrooms in the oven also works wonderfully; just watch them closely to prevent burning.

Customizing Your Sliders

One of the best aspects of these sliders is their versatility. While the base ingredients are delicious on their own, you can really get creative with toppings. Consider adding sliced tomatoes, pickled onions, or even a layer of cheese if you're not strictly vegan. Just be sure to balance the flavors; for instance, spicy toppings like jalapeños work well with creamy elements like avocado, enhancing the overall richness of the slider.

For a unique twist, you can transform these sliders into a Mediterranean delight. Swap out the spinach for arugula and add feta cheese and olives for a burst of flavor. If you're preparing these for a crowd, you can easily scale the recipe by doubling the ingredients and preparing them on a larger grill surface. Plan for about two mushrooms per slider, ensuring each person receives a satisfying portion.

Ingredients

Sliders

  • 4 large portobello mushrooms
  • 2 tablespoons olive oil
  • 2 tablespoons balsamic vinegar
  • 2 cloves garlic, minced
  • 4 slider buns
  • 1 avocado, sliced
  • Fresh spinach leaves
  • Salt and pepper, to taste

Garlic Aioli (optional)

  • 1/2 cup mayonnaise
  • 1 clove garlic, minced
  • 1 tablespoon lemon juice
  • Salt and pepper, to taste

Feel free to add other toppings like roasted red peppers or pickled onions for extra flavor!

Instructions

Marinate the Mushrooms

In a bowl, whisk together olive oil, balsamic vinegar, minced garlic, salt, and pepper. Add the portobello mushrooms and let them marinate for at least 15 minutes.

Prepare the Grill

Preheat your grill to medium-high heat. Ensure it's clean and lightly oiled to prevent sticking.

Grill the Mushrooms

Place the marinated portobello mushrooms on the grill and cook for about 5-7 minutes on each side, until tender and grilled to perfection.

Make the Garlic Aioli

In a small bowl, combine mayonnaise, minced garlic, lemon juice, salt, and pepper. Mix until smooth and adjust seasoning to taste.

Assemble the Sliders

Slice the slider buns in half, toast them lightly, and then layer the grilled mushrooms, sliced avocado, and spinach. Drizzle with garlic aioli if desired.

Serve immediately and enjoy your tasty sliders!

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Pro Tips

  • For an extra kick, add a slice of cheese on top of the mushrooms just before removing them from the grill.

Storage and Make-Ahead Tips

If you're planning to prepare these sliders in advance, consider grilling the mushrooms a few hours ahead of time. Store the grilled portobellos in an airtight container in the refrigerator for up to three days. When you’re ready to serve, warm them gently on the grill or in the oven, covered, to avoid drying them out. This makes for a quick assembly when unexpected guests arrive.

The garlic aioli can also be made ahead and stored in the fridge for up to one week. Just ensure it's kept in a sealed container. The flavors will meld beautifully over time, enhancing the overall taste of the sliders. You can even experiment by adding different herbs to the aioli for variations, such as fresh dill or parsley, which can brighten up the flavor profile.

Serving Suggestions

These sliders pair exceptionally well with a variety of sides. For a lighter option, consider serving them with a mixed green salad topped with a light vinaigrette. If you prefer something heartier, sweet potato fries or a grain-based salad can complement the flavors beautifully. Adding a selection of dipping sauces can also enhance the experience; think tangy barbecue sauce or a zesty chimichurri.

Don’t forget to consider beverage pairings! A refreshing iced tea or a light beer can balance the rich flavors of the grilled mushrooms. For a more indulgent option, serve with craft sodas or a fruity mocktail. Encouraging guests to customize their sliders and sides can make for a fun and interactive dining experience.

Questions About Recipes

→ Can I use other types of mushrooms?

Yes, you can use other large mushrooms like portobello or even shiitake for a different flavor.

→ How do I store leftovers?

Store the assembled sliders in an airtight container in the refrigerator for up to 2 days.

→ Can I make the aioli in advance?

Absolutely! The garlic aioli can be made a day ahead and stored in the refrigerator.

→ What can I serve with the sliders?

These sliders pair well with a side salad, sweet potato fries, or coleslaw.

Sliders with Grilled Portobello Mushrooms

I love making sliders with grilled portobello mushrooms because they are a delicious and satisfying plant-based option. With their meaty texture and rich flavor, these mushrooms are perfect for a casual gathering or a weeknight dinner. The best part is that they take just 30 minutes to prepare, yet pack a punch in taste. I often serve them with a zesty aioli and fresh toppings for an extra kick, making them a hit with everyone, regardless of whether they're vegetarian or not.

Prep Time10 minutes
Cooking Duration20 minutes
Overall Time30 minutes

Created by: Kendra Lawson

Recipe Type: No-Fuss Ideas

Skill Level: Beginner

Final Quantity: 4 servings

What You'll Need

Sliders

  1. 4 large portobello mushrooms
  2. 2 tablespoons olive oil
  3. 2 tablespoons balsamic vinegar
  4. 2 cloves garlic, minced
  5. 4 slider buns
  6. 1 avocado, sliced
  7. Fresh spinach leaves
  8. Salt and pepper, to taste

Garlic Aioli (optional)

  1. 1/2 cup mayonnaise
  2. 1 clove garlic, minced
  3. 1 tablespoon lemon juice
  4. Salt and pepper, to taste

How-To Steps

Step 01

In a bowl, whisk together olive oil, balsamic vinegar, minced garlic, salt, and pepper. Add the portobello mushrooms and let them marinate for at least 15 minutes.

Step 02

Preheat your grill to medium-high heat. Ensure it's clean and lightly oiled to prevent sticking.

Step 03

Place the marinated portobello mushrooms on the grill and cook for about 5-7 minutes on each side, until tender and grilled to perfection.

Step 04

In a small bowl, combine mayonnaise, minced garlic, lemon juice, salt, and pepper. Mix until smooth and adjust seasoning to taste.

Step 05

Slice the slider buns in half, toast them lightly, and then layer the grilled mushrooms, sliced avocado, and spinach. Drizzle with garlic aioli if desired.

Extra Tips

  1. For an extra kick, add a slice of cheese on top of the mushrooms just before removing them from the grill.

Nutritional Breakdown (Per Serving)

  • Calories: 350 kcal
  • Total Fat: 20g
  • Saturated Fat: 3g
  • Cholesterol: 0mg
  • Sodium: 400mg
  • Total Carbohydrates: 32g
  • Dietary Fiber: 4g
  • Sugars: 2g
  • Protein: 6g