Portabella Tuna Melts

Before I discovered cooking Keto recipes, I used to love making Tuna melts on all different types of bread. However I was one day introduced to replacing the bread with a Portabella Mushroom and I have never looked back!
Portabella Tuna Melts are a delicious and easy to make dinner option. This creative twist on the traditional tuna melt is sure to be a hit with your family.
This version using Portabella mushrooms, creamy cheese, and savory tuna, bring another great way to enjoy dinner without compromising taste and using entirely keto friendly ingredients. Enjoy this simple and tasty meal idea that you can whip up in just minutes.
Ingredients
- 2 portabella mushrooms, stems removed and wiped clean
- 1 can of Tuna in Olive Oil, drained and flaked
- 1/4 cup shredded cheese (mozzarella or cheddar work great)
- 2 tblsp mayonnaise
- 1/2 c diced red onion
- 1/4 c chopped green onion
- 1/4 teaspoon garlic powder
- Salt and pepper
How to make our Portabella Tuna Melts
The first step is to preheat your oven to 375°F, line a baking sheet with parchment paper and gather all your ingredients. For this recipe we recommend using tuna in olive oil as it helps to keep the tuna from drying out.
The next step is to take your portabella mushrooms and to gently rinse them in water to remove any dirt or debris. Then carefully remove the stems and use a paper towel to lightly dry them off. You may wish to remove the gills from the inside of the mushroom cap as well.
Once your mushrooms have been cleaned, place them on the parchment lined baking sheet with the opening of the mushrooms facing up.
Next you want to prepare the tuna melt filling for your mushrooms. Drain your tuna well and then add it to a medium bowl. Add some salt and pepper and move on to the next step.
Take your diced red and green onion and add it to the bowl with the tuna. If you havent already diced it, dice it to the size that you like. You may choose to dice slightly larger pieces of onion for a more crunchy texture. Alternatively, you could saute them in pan with a little bit of butter to soften the onion for less of an onion texture.
Once you have made a decision, add your red onions to bowl with the mayonnaise and garlic powder and combine everything together.
Once the tuna filling is complete, divide it evenly among the portabella mushrooms and top each mushroom with a generous amount of cheese.
Finally, transfer your baking sheet to the preheated oven and bake for 15-20 minutes or until the cheese is melted and bubbly.
Once your Portabella Tuna Melts are finished cooking, remove them from the oven, top wit some leftover diced green onion or cilantro and enjoy! The mushrooms may shrink slightly in the oven as they have a high concentration of water which will come out and evaporate during cooking, but they should hold their shape nicely.
Portabella Tuna Melts are a delicious and easy to make dinner option that your family will love.
Enjoy these delicious Portabella Tuna Melts as a starter or paired with a side of vegetables or salad to make a complete meal.

Portabella Tuna Melts
Portabella Tuna Melts are a delicious and easy to make dinner option that your family will love.
Ingredients
- 2 portabella mushrooms, stems removed and wiped clean
- 1 can of Tuna in Olive Oil, drained and flaked
- 1/4 cup shredded cheese (mozzarella or cheddar work great)
- 2 tblsp mayonnaise
- 1/2 c diced red onion
- 1/4 c chopped green onion
- 1/4 teaspoon garlic powder
- Salt and pepper, to taste
Instructions
- Preheat oven to 375°F. Line a baking sheet with parchment paper or aluminum foil.
- Clean portabella mushrooms, remove stems and use a paper towel to lightly dry. Place the mushrooms on the baking sheet with the opening of the mushrooms facing up.
- Drain the tuna and add to a medium bowl and flake well before seasoning with black pepper.
- In the medium bowl with the tuna, add the diced onions, mayonnaise, garlic powder and season with salt and pepper.
- Once well combined, divide the mixture evenly among the mushrooms.
- Top each mushroom with the shredded cheese.
- Bake for 10-15 minutes until cheese is melted and bubbly.
- Serve immediately with topped cilantro and enjoy!
Notes
We recommend using Tuna in Olive Oil for the best results and feel free to vary the cheese on top with whatever you desire!
Nutrition Information:
Yield: 2 Serving Size: 1Amount Per Serving: Calories: 366Total Fat: 25gSaturated Fat: 6gTrans Fat: 0gUnsaturated Fat: 17gCholesterol: 56mgSodium: 661mgCarbohydrates: 6gFiber: 2gSugar: 4gProtein: 26g