French Onion Soup Stuffed Mushrooms Recipe

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This easy and delicious French Onion Soup Stuffed Mushrooms recipe makes the perfect holiday and party appetizer! Rich French Onion Soup meets savory stuffed mushrooms in this favorite recipe! 

Looking for more delicious appetizers? I think you’ll love my praline baked brie, Swedish Meatballs, and Ranch Oyster Crackers.

Close up of mushroom caps topped with cheese and parsley on a parchment lined baking sheet

The cheesy, decadent flavors of French Onion Soup, caramelized onions, and melty cheese make a rich mushroom stuffing. This appetizer’s elevated flavor and presentation make it a favorite to serve on holidays and special occasions.

Stuffed mushrooms have always been such a popular party food and holiday appetizer. French Onion Soup Stuffed Mushrooms are so easy to make and yet so elegant to serve guests at a party or with a delicious meal. Roasted to perfection, they combine the fantastic flavor of my homemade French Onion Soup with tasty, cheesy mushrooms. This is a great appetizer recipe to keep in mind for upcoming parties and gatherings.

French Onion Soup Stuffed Mushrooms Recipe

Overhead view of parchment lined baking sheet with stuffed mushrooms topped with cheese and parsley

Why You’ll Love This Recipe

Rich Flavor. The savory French Onion Soup taste combines with the rich, cheesy flavor of the stuffed mushrooms for a taste that’s out of this world.

Easy to Make. With its few simple yet flavor-packed ingredients, this recipe comes together quite simply and easily.

Impressive to Serve. Guests always rave over these stuffed mushrooms!

Filled with everything I love about French Onion Soup, all stuffed into a delicious mushroom cap and then roasted to perfection, this makes an appetizer I think you’ll love.

How to Make French Onion Soup Stuffed Mushrooms

Mushroom caps in rows on a parchment lined baking sheet

French Onion Soup Stuffed Mushroom Ingredients

You’ll need the following ingredients for these stuffed mushrooms: whole fresh mushrooms, onion, beef stock or broth, butter, sourdough bread, Stone House Seasoning, grated Gruyere cheese, and grated Parmesan cheese. Freshly chopped parsley is an optional ingredient I use as a garnish.

How to Make French Onion Soup Stuffed Mushrooms

This appetizer is incredibly easy to make with just a few flavorful ingredients and simple steps.

  • Clean and prep the mushrooms. To make the stuffed mushrooms, start by cleaning the mushrooms with a damp paper towel. Then, carefully remove the stems of the mushrooms and place the mushroom caps on a parchment paper-lined baking sheet.
  • Cook mushroom stems and onions. Chop the stems and onions thinly and cook until tender and caramelized.
Sourdough bread crumbs in a glass bowl
  • Make the bread crumbs. Pulse a piece of sourdough bread (or bread you have on hand) in a blender or food processor for a few seconds with the Stone House Seasoning. You can use store-bought bread crumbs, but get them unseasoned and then add Stone House Seasoning.
Mushroom caps topped with cheese on lined baking sheet
  • Stuff the mushrooms. Fill each of the mushroom caps with seasoned bread crumbs.
Caramelized onions and diced mushroom stems fill mushroom caps sitting on a piece of parchment
  • Top the mushrooms. Then, top the mushrooms with the caramelized onions and mushroom stems.
Parchment lined baking sheet holds rows of stuffed mushrooms topped with shredded cheese
  • Sprinkle with cheese and bake. Top the stuffed mushrooms with both kinds of grated cheese and another sprinkle of seasonings. Place them into the oven to bake.
Stuffed mushrooms topped with melty cheese on a baking sheet surrounded by bits of chopped parsley and shredded cheese
  • Garnish with parsley (optional). Add a sprinkle of fresh parsley as the stuffed mushrooms come out of the oven and enjoy!

How to Make Ahead and Store French Onion Soup Stuffed Mushrooms

This appetizer recipe is perfect for serving when entertaining, but if you are like me, you like to have many recipes made ahead for parties, holiday gatherings, dinners with guests, or even on game days! That’s one of the things I love about this recipe. You can assemble them ahead and bake them before serving.

To make ahead: Follow the recipe instructions up to the point before baking. Cover the baking sheet well and store the stuffed mushrooms in the refrigerator for 3 days.

To heat and serve: About 45 minutes before serving, remove the cover from the baking sheet and bake them as directed. They may take an extra few minutes since they are chilled in the refrigerator.

More Appetizers You’ll Love

Southern Pimento Cheese

Spinach Artichoke Dip

Easy Mini Quiche

Buffalo Chicken Dip

The Best Salsa

Crispy Baked Buffalo Chicken Wings

Here’s my French Onion Soup Stuffed Mushrooms Recipe. I hope you enjoy it as much as my family does!

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