Stuffed Mushrooms

Stuffed mushrooms are a warm appetizer with a savory filling that stays moist inside a tender mushroom cap. The filling is a simple mix of breadcrumbs, cheese, and herbs that browns in the oven while the mushroom releases its liquid and softens. The result is a bite-sized appetizer that is cooked through in 25 minutes and holds warm on a platter for a party.

Ingredients for Stuffed Mushrooms

Button mushrooms form the edible vessel and soften as they release moisture. Panko breadcrumbs give the filling crisp texture and absorb the mushroom liquid without turning soggy. Parmesan cheese adds sharp flavor and browns on top. Garlic and fresh parsley bring brightness to the filling. Olive oil helps everything brown and keeps the filling moist. Salt and black pepper season the whole dish. Onion adds sweetness to the filling.

Why This Stuffed Mushrooms Works

Mushrooms are mostly water, so when you roast them, they soften and release liquid into the pan. This liquid soaks into the breadcrumb filling instead of leaving it dry. The filling sits on top of the mushroom cap, so the heat reaches it from above, browning the cheese and breadcrumbs while the mushroom cooks through below.

Panko breadcrumbs are larger than regular breadcrumbs and stay crisp longer because they absorb liquid more slowly. This means the filling stays textured and doesn’t turn to paste even as the mushroom softens. A hot oven (400°F) cooks the mushrooms tender in 25 minutes and browns the topping without burning it.

Mistakes To Avoid

Leaving the gills in place keeps the filling from making contact with the mushroom flesh and prevents them from cooking evenly. The mushrooms will bake unevenly, with some caps still firm while others collapse. Scoop out the gills with a small spoon and discard them.

Stuffing the mushrooms too far ahead and leaving them uncovered lets them dry out on the counter and turn gray. Stuff them no more than 4 hours before baking, and cover them loosely with foil if you are not baking right away. They keep best in the refrigerator.

Using fresh breadcrumbs instead of panko makes the filling dense and heavy because fresh breadcrumbs absorb the mushroom liquid too quickly. The texture becomes pasty instead of crisp. Panko is coarser and holds its texture better.

Baking the mushrooms on a flat sheet without a rim lets the liquid run off the pan onto your oven floor. A rimmed sheet pan keeps the liquid in place so the filling stays moist. The liquid also flavors the pan drippings if you want to spoon them over the finished mushrooms.

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Ingredients

• 1 pound button mushrooms
• 1/2 small onion, finely diced
• 2 cloves garlic, minced
• 1 cup panko breadcrumbs
• 1/2 cup grated Parmesan cheese
• 1/4 cup fresh parsley, finely chopped
• 1/4 cup olive oil
• 1/2 teaspoon salt
• 1/4 teaspoon black pepper

Step-by-step Instructions

1. Heat the oven to 400°F (200°C).
2. Wipe the mushrooms clean with a damp paper towel and remove the stems by twisting them gently.
3. Use a small spoon to scrape out the dark gills from the inside of each cap and discard them.
4. In a small skillet over medium heat, warm 2 tablespoons of the olive oil and add the diced onion, cooking for 3 to 4 minutes until soft and translucent.
5. Add the minced garlic and cook for 1 minute more until fragrant, then remove the skillet from the heat.
6. In a bowl, mix the breadcrumbs, Parmesan, parsley, cooked onion and garlic, remaining 2 tablespoons of olive oil, salt, and pepper until combined.
7. Arrange the mushroom caps gill side up on a rimmed sheet pan and spoon the filling evenly into each cap, pressing gently so it stays in place.
8. Bake at 400°F (200°C) for 20 to 25 minutes until the mushrooms are tender when pierced with a fork and the filling is golden brown on top.
9. Let the mushrooms rest on the pan for 2 minutes, then transfer to a serving platter and serve warm.