Sliders with Grilled Portobello Mushrooms

Name: Sliders with Grilled Portobello Mushrooms
Prep time: 20 min
Cook time: 15 min
Total time: 35 min
Yield: 4 sliders
Ingredients: 4 large portobello mushrooms, stems removed; 1/4 cup balsamic vinegar; 2 tablespoons olive oil; 1 teaspoon garlic powder; Salt and pepper to taste; 4 slider buns; Lettuce leaves (for garnish); Tomato slices (for topping); Red onion slices (for topping); 1/4 cup mayonnaise; 1 tablespoon Dijon mustard; 1 teaspoon lemon juice

Highlighted under: Modern Comfort Food Inspiration

I absolutely love making sliders, especially when they are packed with flavor and a satisfying texture. These Grilled Portobello Mushroom Sliders are my go-to for gatherings or a casual dinner. The meaty, umami richness of the mushrooms creates a perfect base, and topped with fresh veggies and a zesty sauce, they become a wholesome meal. Plus, they’re incredibly easy to prepare, making them ideal for both busy weeknights and weekend barbecues. Give them a try!

Created by

Bryony Wells

Last updated on 2026-01-05T19:13:34.609Z

When I first tried grilling portobello mushrooms, I was blown away by their ability to absorb flavors while retaining a satisfying texture. I marinated them in a homemade balsamic vinaigrette which gave them a nice tang that balanced beautifully with the toppings. The blend of fresh ingredients truly brings the sliders to life, making each bite a delightful experience.

One of my favorite touches is to grill the buns until they're lightly toasted. This not only adds a bit of crunch but also helps hold together the juicy mushrooms and any toppings you choose. I often pair it with a tangy aioli for a creamy finish. I think you’ll enjoy these sliders just as much as I do!

Why You'll Love This Recipe
Savory grilled mushrooms make a hearty burger alternative
Fresh toppings provide a vibrant crunch
Easy to customize for your favorite flavors

Grilling Techniques for Perfect Mushrooms

To achieve the best flavor and texture in your grilled portobello mushrooms, start by ensuring your grill is preheated to a medium-high temperature of around 400°F to 450°F. This heat level allows for a good sear, creating delicious grill marks while keeping the mushrooms juicy inside. When checking doneness, look for the mushrooms to be tender and shriveled slightly, which usually takes about 5-7 minutes per side. If you encounter any sticking to the grill, consider using a grill spray or oiling the grates beforehand.

Marinating the mushrooms not only enhances their flavor but also helps them retain moisture during grilling. The balsamic vinegar contributes both acidity and sweetness, creating a complex taste profile. I recommend letting them marinate for at least 15 minutes, but if you have more time, extending this to an hour enhances the umami depth even further. Remember to flip them halfway through the marinating process for even coverage.

Mayo-Based Sauce Variations

The creamy sauce is a crucial element that adds a layer of richness to the sliders. While the basic mix of mayonnaise, Dijon mustard, and lemon juice is delightful, feel free to experiment with additional ingredients. A dash of smoked paprika can provide a smoky flavor, while adding minced garlic or fresh herbs like dill or basil can elevate the freshness. If you're looking to swap out mayonnaise for a lighter option, consider using Greek yogurt; it offers a similar creaminess with added protein and tang.

To balance the acidity from the lemon juice in the sauce, consider adding a teaspoon of honey or maple syrup for a hint of sweetness. This small adjustment can round out the flavors beautifully. Additionally, if you enjoy a bit of heat, incorporating some Sriracha or a pinch of cayenne pepper can add a spicy kick tailored to your liking.

Ingredients

Gather the following ingredients to start making your sliders.

For the Sliders

4 large portobello mushrooms, stems removed
1/4 cup balsamic vinegar
2 tablespoons olive oil
1 teaspoon garlic powder
Salt and pepper to taste
4 slider buns
Lettuce leaves (for garnish)
Tomato slices (for topping)
Red onion slices (for topping)

For the Sauce

1/4 cup mayonnaise
1 tablespoon Dijon mustard
1 teaspoon lemon juice

Once you’ve assembled all ingredients, you’re ready to cook!

Instructions

Follow these steps to create your delicious sliders.

Marinate the Mushrooms

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

Prepare the Sauce

Combine mayonnaise, Dijon mustard, and lemon juice in a small bowl. Mix until smooth and set aside.

Grill the Mushrooms

Preheat the grill to medium-high heat. Grill the marinated portobello mushrooms for about 5-7 minutes on each side, or until they are tender and have grill marks.

Toast the Buns

During the last few minutes of grilling, place the slider buns on the grill, cut side down, and toast until golden brown.

Assemble the Sliders

Spread the sauce on the bottom half of each bun. Top with lettuce, the grilled portobello mushroom, tomato, and onion slices. Place the other half of the bun on top and serve.

Enjoy your sliders fresh off the grill for the best taste!

Pro Tips

Experiment with different toppings like avocado or fresh herbs for added flavor. These sliders also pair wonderfully with sweet potato fries.

Customizing Your Sliders

One of the aspects I love about these sliders is their versatility. You can easily customize the toppings according to what you have on hand or personal preferences. For a twist, try adding avocado slices for creaminess, or switch up the tomatoes with roasted red peppers for added sweetness. Experimenting with different greens, like arugula or spinach, also provides a different texture and flavor profile that can enhance the overall experience.

If you're catering to a specific diet, these sliders are accommodating. For a gluten-free version, swap the slider buns for gluten-free alternatives or lettuce wraps. Likewise, if a vegan option is preferred, ensure the mayonnaise used is egg-free, and consider additional plant-based toppings like vegan cheese or cucumber slices for added crunch and flavor.

Storage and Reheating Tips

These sliders can be prepped ahead of time, making them ideal for meal prep. Marinated mushrooms can be stored in the fridge for up to two days before grilling. If you have leftover grilled mushrooms, store them in an airtight container; they'll last for about three days in the refrigerator. When reheating, place them in a skillet over medium heat just until warmed through to avoid drying them out.

If you're looking to freeze any components, I recommend freezing the marinated mushrooms before grilling. Once they are frozen, simply thaw them overnight in the refrigerator and then grill as directed. The sauce can also be made in advance and kept in an airtight container in the fridge for about a week. This can save you time in the kitchen and allows you to enjoy these delicious sliders more often!

Questions About Recipes

→ Can I prepare the mushrooms in advance?

Yes, you can marinate the mushrooms a few hours ahead and keep them in the refrigerator until you're ready to grill.

→ Are there any alternatives to portobello mushrooms?

You can use large eggplant slices or grilled zucchini for a different vegetable option.

→ What sides pair well with these sliders?

Fries, coleslaw, or a light salad complement the sliders nicely.

→ Can I make these sliders vegan?

Absolutely! Just use vegan mayo for the sauce, and ensure the buns are vegan-friendly.