How many servings does this recipe make?

This recipe makes 4 servings. You can adjust the portion size directly on this page.

What ingredients do I need for Stuffed Tuna Melt Mushrooms?

You need 13 ingredients. The key ingredients include: 3 Tablespoons Red Onion, Diced, 1/2 cups Green Bell Pepper, Diced, 1/2 whole Jalapeno, Seeded And Diced, 1/4 cups Mayonnaise, and more.

Is Stuffed Tuna Melt Mushrooms suitable as seafood?

Yes, Stuffed Tuna Melt Mushrooms falls under the Seafood category and is a great choice for this type of meal.

How do I store leftover Stuffed Tuna Melt Mushrooms?

Store leftovers in an airtight container in the refrigerator for up to 3–4 days. Reheat gently before serving.

Stuffed Tuna Melt Mushrooms Recipe

Name: Stuffed Tuna Melt Mushrooms
Prep time: 15 min
Cook time: 30 min
Total time: 45 min
Yield: 4 servings
Ingredients: 3 Tablespoons Red Onion, Diced; 1/2 cups Green Bell Pepper, Diced; 1/2 whole Jalapeno, Seeded And Diced; 1/4 cups Mayonnaise; 12 ounces, weight Canned Tuna, Packed In Water, Drained; 1/4 cups Fresh Parsley, Chopped; 1 teaspoon Red Wine Vinegar; 1 teaspoon Dijon Mustard; Salt And Pepper, to taste; 16 ounces, weight Baby Portobello Mushrooms, Cleaned And Stems Removed; 2 Tablespoons Olive Oil; 2 whole Roma Tomatoes, Sliced Thin; 4 slices White American Cheese, Cut Into Quarters

Try this homemade Stuffed Tuna Melt Mushrooms recipe the whole family will love. Made with Red Onion, Green Bell Pepper, Mayonnaise and Water. Easy step…

This Stuffed Tuna Melt Mushrooms relies on simple, everyday ingredients such as red onion, diced, green bell pepper, diced, mayonnaise and fresh parsley, chopped. It comes together quickly and makes 4 servings, at about 442 kcal each. The step-by-step instructions below are written to be easy to follow, even on a busy day.

It's versatile enough for an easy weeknight dinner yet satisfying enough for guests at the weekend. Serve it with your favorite sides, and keep any leftovers for a quick meal the next day.

Updated Jun 30, 2026

Serves 4 Seafood

Tips for the best results

Read through all the steps once before you start and measure out your ingredients first — it makes everything go more smoothly.
Taste as you go and adjust the seasoning before serving.
Avoid overcrowding the pan — cook in batches if needed for the best texture.
Let the dish rest for a few minutes before serving so the flavors settle.
Store leftovers in an airtight container in the fridge and enjoy within a few days.

Variations & substitutions

Feel free to swap in similar ingredients you already have on hand and adjust seasoning to taste.

No specific allergen information. Please check the ingredient list for possible allergens.

My Personal Notes

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Stuffed Tuna Melt Mushrooms

Tips for the best results

Variations & substitutions

My Personal Notes

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Frequently Asked Questions