Tuna Melt Stuffed Mushrooms

5 from 1 vote

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Tuna Melt Stuffed Mushrooms are an easy stuffed mushroom recipe made with canned tuna, mayonnaise, and relish like the sandwich. This pantry party appetizer is fast, ready in 20 minutes, gluten free, and keto low carb.

Tuna Melt Stuffed Mushrooms are a take on the classic tuna sandwich. Mushroom caps are stuffed with a tuna mixture, topped with cheddar cheese, and baked.

Tuna Melt Stuffed Mushrooms close up

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These easy stuffed mushrooms is a fast recipe that is based on the classic tuna melt sandwich. A tuna salad is topped with cheddar cheese and toasted off – but this time inside of a mushroom cap! I like to use little crimini mushrooms which are baby portabellos but you can use any mushroom you like or have.

A hand holding a stuffed mushroom

A Tuna Melt Stuffed Mushroom sliced open on lettuce with more mushrooms in the background

Stuffed mushroom recipes are a great option for parties.  They hold some elegance while being incredibly simple to make.  These tuna stuffed mushrooms are keto, low carb, and gluten free, which makes them perfect to feed a crowd.

Using canned tuna is perfect for this recipe and you can use as much or little mayo as you want. You might want to be careful with the mayo, though, because too much can make it messy and difficult to eat. Personally, we are a Miracle Whip house in the very polarizing debate of which is the best mayonnaise. What are the mayo rules in your house?

Tuna Melt Stuffed Mushrooms sitting on lettuce

Finding new ways to use classic flavors is a great way to make appetizers and entertaining exciting.  Find our stuffed mushroom recipes here!

A hand holding a mushroom with tuna and cheddar that has been cut in half

To make the Tuna Melt Stuffed Mushrooms, make your tuna mixture with mayonnaise, relish, and seasoning. Stuff each cap with the tuna and then top with a small slice of cheddar cheese, just like a tuna melt sandwich! Bake for approximately 10 minutes and they are ready! 

You can easily make large batches by preparing them in advance by filling the caps, and then bake them off when you are ready to serve them.  Bake a little longer for softer mushrooms, but they become a little more difficult to eat by hand. I love to top off the mushrooms with a little more pickle relish, which I am somewhat obsessed with in the first place, but also makes the perfect garnish for these stuffed mushrooms.

Top view of Tuna Melt Stuffed Mushrooms

Stuffed Mushrooms

Various stuffed mushroom recipes that are perfect for appetizers and entertaining!

Pin image of a hand holding Tuna Melt Stuffed Mushrooms with title at bottom


Tuna Melt Stuffed Mushrooms

Tuna Melt Stuffed Mushrooms are an easy stuffed mushroom recipe made with canned tuna, mayonnaise, and relish like the sandwich. This pantry party appetizer is fast, ready in 20 minutes, gluten free, and keto low carb.
5 from 1 vote
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Course: Appetizer
Cuisine: American
Keyword: 30 Min or Less, Game Day, Gluten Free, Keto/Low Carb, Seafood
Prep Time: 10 minutes
Cook Time: 10 minutes
Total Time: 20 minutes
Servings: 12 mushrooms
Calories: 41kcal


  • 12 mushrooms (crimini or white button) (approximately 1.5-2 inches wide)
  • 5 ounces canned tuna (one can)
  • 1 1/2 Tablespoons mayonnaise
  • 1 Tablespoon relish
  • salt
  • black pepper
  • 2 pieces sliced cheddar cheese (or 1/2 cup shredded)


  • Preheat oven to 350F.
  • Prepare the mushrooms by wiping off the caps and removing all of the stems.
  • Make the tuna mixture by combining the drained tuna, mayonnaise, and relish. Season with a pinch of salt and pepper. Stir to combine.
  • Line the mushrooms up in a baking dish, cap side down. Scoop the tuna mixture into the bottom of each cap. The mixture can mound up a little over the top of the mushroom.
  • Cut the cheese slices into six pieces each (for a total of 12 cheese pieces). Lay a piece of cheese over each mushroom. (If using shredded cheese, simply sprinkle over each mushroom).
  • Bake the mushrooms for 10-15 minutes until the mushrooms are tender. Bake longer if you want softer mushrooms, however they will become more difficult to eat by hand. If desired, top each mushroom with more relish for garnish. Serve immediately.


The sliced cheese results in a fully covered top and is more similar to a true tuna melt, but shredded cheese works well also.


Calories: 41kcal | Carbohydrates: 1g | Protein: 4g | Fat: 3g | Saturated Fat: 1g | Cholesterol: 8mg | Sodium: 77mg | Potassium: 85mg | Fiber: 1g | Sugar: 1g | Vitamin A: 7IU | Vitamin C: 1mg | Calcium: 27mg | Iron: 1mg
By on July 16th, 2020

About Kim

Kim has grown up with a passion for cooking good food! You can find her in the kitchen experimenting with new recipes, making dog treats, and eating Italian food!

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