Spicy Grilled Onion Stuffed Mushrooms

^{This post has been sponsored by Miller's Banana Pepper Sauce. All opinions expressed are my own.}

I absolutely adore stuffed mushrooms, whether it's Mediterranean-style Stuffed Mushrooms or Sausage Stuffed Mushrooms, they are one of my go-to appetizers. However, this onion-stuffed mushroom recipe puts a little twist on the traditional formula courtesy of my good friends over at Miller's Banana Pepper Sauce. What makes this recipe special isn't hard-to-find ingredients or complicated techniques; it's the simple yet delicious combination of caramelized onions, gorgonzola, and Miller's Banana Pepper Sauce, which ties everything together beautifully, but more on them below.

These stuffed mushrooms feature a golden-brown Panko top that's deliciously crisp and bubbling with melted gorgonzola, mixed with the earthy aroma of roasted mushrooms. That same crispy coating gives way to juicy mushroom caps filled with jammy sweet onions, garlicy goodness, and added chili depth courtesy of Miller's Banana Pepper Sauce. Let me be clear, this is not a delicate or dainty one-note appetizer; these mushrooms pack substantial flavor with serious depth and personality loaded into each bite.

If you're looking for an appetizer that's perfect for game day spreads, cocktail parties, or any gathering where you want to impress your guests without spending hours in the kitchen, these stuffed mushrooms have got you covered. Now, without further introduction, let's stuff some mushrooms. Read on for a recipe overview, complete ingredient checklist, tips for success, and a printable recipe card.

Recipe Overview - Spicy Grilled Onion Stuffed Mushrooms

Taste and Texture

Our Onion Stuffed Mushrooms offer up an elegant yet accessible combo of savory and spicy, with just a hint of background sweetness. The Miller's Pepper Sauce combines particularly well with the gorgonzola used in the filling, while the sweet onions offer a mild oniony bite and provide delicious background sweetness. The filling cooks up creamy, while the mushrooms maintain their form through air frying, despite cooking up moist and tender.

Difficulty Level

Beginner-friendly. All this recipe entails is sautéing the aromatics, mixing the filling, stuffing the mushroom, and then air frying. That's it. Arguably, the hardest part of this recipe is destemming the mushrooms, which comes down to a quick twist and pull.

Preparation Process

The entire prep process takes about 35 minutes, with only about 15-20 of those minutes being active prep. We start by cleaning and destemming the mushrooms (5 minutes). From there, we saute the onion mixture (8-10 minutes), stuff the mushrooms (5 minutes max), then air fry (7-12 minutes). We add in the Miller's during the sautéing.

Pairings

Our Onion Stuffed Mushrooms recipe is a great starter, pairing especially well with things like blue cheese, charcuterie, or even as the centerpiece of a lush appetizer platter. Think game day parties, tapas-style dinners, or alongside other finger foods like crostini.

Spicy Grilled Onion Stuffed Mushrooms Recipe - Ingredient Checklist

• 12 Medium-Sized White Button Mushrooms
  • Firm Mushrooms: Use firm mushrooms so that they hold their shape through cooking.
  • What is medium-sized? For this recipe, aim for mushrooms that are about two inches in diameter, unblemished, with closed caps.
  • How to Clean: Rinse them under water. There is a myth about never cleaning mushrooms that has seemingly taken the internet by storm. This myth is roughly half-truth and half-myth. We'll cover this more below, but as long as you're not leaving your mushrooms to soak in a basin of water, you'll be fine.
• 2 Sweet Onions, sliced very thin
  • Which Onions to Use: Use Vidalia, Walla Walla, or Maui sweet onions for natural sweetness.
  • Slice Thin: Slice the onions as thin as possible. Onions are the base of the stuffing and the source of the sweetness, so we want them sliced thin.
• 2 Cloves of Garlic, grated
  • Grated not Chopped: We want to grate the garlic to achieve maximal distribution and maximal release of the garlic's natural juices. This cannot be achieved via chopping, even very fine chopping.
• 2-3 Tablespoons Fresh Italian Parsley, chopped
  • Flat-Leaf Italian Parsley: Only use flat-leaf Italian parsley. Curly leaf parsley is almost exclusively used as a garnish. Unless a recipe explicitly calls for curly leaf parsley, use flat-leaf parsley. This is cooking with herbs 1-0-1.
  • Wash and Dry: Be sure to rinse the parsley thoroughly, and then dry it thoroughly.
• 2 Tablespoons Miller's Hot Sauce
  • The Star of the Show: The secret ingredient for the stuffing. The reason Miller's Banana Pepper Hot Sauce works so beautifully in this recipe comes down to the chili pepper goodness and subtle heat and background sweetness, which deliciously complements the mushrooms themselves, while melding beautifully with the blue cheese - making for a classic game day favorite, or a savory starter.
• 2 Tablespoons Olive Oil (plus more for drizzling)
  • Extra Virgin: I recommend using a decent quality olive oil for this recipe.
  • Stuffing: The initial two tablespoons are for the stuffing mixture. It helps provide moisture, binding, and flavor.
  • Drizzling: The olive oil for drizzling helps brown the panko crust.
• ½ Teaspoon coarse-ground black pepper
  • Fresh Ground: For better aromatic depth, I recommend freshly ground pepper. Yes, I say this every chance I get.
  • Substitution: As always, pre-ground will get the job done just fine.
• ½ cup crumbled Gorgonzola Cheese
  • Authentic: I recommend using authentic Italian gorgonzola, as this will give the best results in terms of flavor and aroma.
  • Types of Gorgonzola: Dolce is milder, Picante is sharper. Both work fine. It's entirely a preference. Personally, I'm using Dolce.
  • Substitute: Blue cheese will work just fine.
• 2-3 tablespoons Panko breadcrumbs for topping
  • For Crispiness: Panko are Japanese-style breadcrumbs that help create a crispy texture, giving the mushrooms some delightful texture contrast.
  • Can I use regular breadcrumbs? Yes, absolutely; however, regular breadcrumbs will not provide the same crispy texture.

Enhancing your Onion Stuffed Mushrooms

1. Fresh Thyme or Rosemary
   • Add about a half a teaspoon of fresh thyme leaves or chopped rosemary to the filling. This will bring an earthy, aromatic complexity and deliciously complement the mushroom's natural earthiness. Rosemary also plays beautifully with gorgonzola and blue cheese.
2. Lemon Zest
   • Use about a half-teaspoon of finely grated lemon zest, and add that to the filling. This will bring some nice brightness and subtle citrus notes to the recipe, which will work deliciously with Miller's Banana Pepper Sauce and the blue cheese.
3. Bacon
   • Blue cheese and bacon. Mushrooms and bacon. Pepper sauce and bacon. These are all delicious pairings. Sprinkle some crisped bacon on the top, or mix it into the filling. Delicious.

Tips for Success

Mushroom Prep

The core of this recipe is the mushrooms. They are the largest portion of this recipe by volume and are the delivery method for the stuffing. To get this recipe right, you must get the mushrooms right. For starters, never submerge your mushrooms in water (for too long). You can rinse them under water, and yes, you can submerge them in water - just don't leave them. A quick in and out to get the dirt off is fine. I say this because mushrooms are a bit like sponges. Their porous, and that means they soak up water fairly quickly. So, rinse them, get the dirt off, and pay special attention to the gills, since that's where dirt likes to accumulate. Also, remove the stems gently by twisting and pulling rather than cutting, as this will create a deeper, more natural cavity for stuffing. For extra flavor, brush the caps with olive oil and season with a pinch of salt before stuffing.

Onion Caramelization

The onions are the core ingredient of the stuffing, and comprise most of the stuffing's mass, which means you need to get the onions right. Step one is slicing the onions as thin as you possibly can. Next up is not rushing the sauteing process. Cook over medium heat, resist the temptation of using high heat, and allow the onions' natural sugars to caramelize without burning. You want soft, translucent onions with a slight golden sheen. This takes about ten minutes. Perfectly caramelized onions provide a delicious base for this recipe's secret ingredient - Miller's Banana Pepper Hot Sauce.

Miller's Hot Sauce Strategy

Add the Miller's Banana Pepper Sauce after the onions have fully softened and caramelized, not at the beginning. We do this to allow the sauce to coat the onions without cooking off its distinctive chili pepper brightness. Toss the onions thoroughly after adding the sauce to ensure thorough coating.

Stuffing Technique for Maximum Stuffing Capacity

There's no need to be timid when stuffing the mushrooms. Everything is already cooked, and the mushrooms are not going to collapse due to stuffing. You want a nice mound atop the mushrooms that extends beyond the rim. The filling will settle and shrink slightly through cooking. Use a small spoon to press the onion mixture firmly into the mushroom cavity to eliminate any air pockets, which will cause the filling to ooze out. Then top each mushroom with a generous pinch of gorgonzola, followed by the panko breadcrumbs. Finish with a drizzle of olive oil, and then into the air fryer they go.

Air Fryer Success

We're preheating the air fryer to 350 degrees F for this recipe for about 3-5 minutes before adding in the mushrooms. Even cooking is absolutely crucial. Line the air fryer basket or tray with parchment paper. Arrange the mushrooms in a single layer with space between each - air flow is crucial for even cooking.

Print

And those are our Spicy Grilled Onion Stuffed Mushrooms! If you enjoyed this recipe, or have any questions or suggestions, be sure to let us know in the comments below. We always love hearing from you. And, as always, be sure to check out our good friends at Miller's Banana Pepper Sauce.

Happy Cooking!

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