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 Oven Baked Tuna Sandwiches?

You need 12 ingredients. The key ingredients include: 2 cans tuna your choice, I prefer water packed, 1 onion small, chopped and sauteed until browned, 2 hard boiled eggs chopped, 1/2 packet splenda you could omit this if you use sweet relish, and more.

Is Oven Baked Tuna Sandwiches suitable as seafood?

Yes, Oven Baked Tuna Sandwiches falls under the Seafood category and is a great choice for this type of meal.

How do I store leftover Oven Baked Tuna Sandwiches?

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

Oven Baked Tuna Sandwiches Recipe

Name: Oven Baked Tuna Sandwiches
Prep time: 15 min
Cook time: 30 min
Total time: 45 min
Yield: 4 servings
Ingredients: 2 cans tuna your choice, I prefer water packed; 1 onion small, chopped and sauteed until browned; 2 hard boiled eggs chopped; 1/2 packet splenda you could omit this if you use sweet relish; 1/4 cup relish dill; 1/2 cup mayonnaise I used 1/2 regular and 1/2 light; 1/2 pound cheese cubed, I used 1/2 Monterrey Jack and 1/2 Velveeta; 1 tablespoon capers; 1 tablespoon green olives chopped, optional; Old Bay Seasoning to taste; Tabasco optional; hamburger buns or any kind of sandwich roll

Try this homemade Oven Baked Tuna Sandwiches recipe the whole family will love. Made with your choice, onion, eggs and could omit. Easy step-by-step ins…

This Oven Baked Tuna Sandwiches relies on simple, everyday ingredients such as hard boiled eggs chopped, relish dill, capers and old bay seasoning to taste. It comes together quickly and makes 4 servings, at about 745 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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Oven Baked Tuna Sandwiches

Tips for the best results

Variations & substitutions

My Personal Notes

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Frequently Asked Questions