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15 Toppings For Tuna Casserole That’ll Make Your Mouth Water

I recently made a delicious tuna casserole, and it got me thinking about the many different toppings I could add to make it even more flavorful.

I decided to do some research to find the best 15 toppings for tuna casserole that will make your mouth water.

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Tuna Casserole Toppings

From crunchy croutons to savory parmesan cheese, this list has all the ingredients you need to make your next tuna casserole a delicious success.

1. Crushed potato chips

Crushed potato chips

I’m a total chips lover, so I love adding crushed potato chips to my casseroles.

It adds a nice crunch and extra flavor, plus it looks great too!

I like to use plain or lightly salted chips for this purpose, since the other flavors can be quite overpowering.

  1. To prepare them, just put them in a plastic bag and crush with a rolling pin or heavy pot.
  2. Sprinkle over your favorite casserole before baking and enjoy!

Pro Tip: Try different flavored chips for new flavors – sour cream & onion works really well here.

2. Toasted breadcrumbs

Simple, yet oh so effective.

Breadcrumbs are great for adding a crunchy texture to your casserole and more flavor.

I like to toast my breadcrumbs before using them, as this will help bring out the nutty flavors in them.

  1. To do this, all you need is some butter or oil on medium heat and stir until golden brown (takes about 5 minutes).
  2. Then add it onto your casserole dish!

Pro Tip: You can also use whole wheat panko crumbs for an even better texture and flavor!

3. Chopped bacon bits

Bacon Bits

Who doesn’t love bacon?

Chopped bacon bits are a great way to add extra flavor, texture and saltiness to your casserole.

I like to fry it up until it’s golden and crispy in a separate pan before adding it as a topping.

It also adds some crunchy contrast to the softness of the casserole.

You can easily make your own bacon bits by cutting cooked bacon into small pieces with kitchen shears or a knife.

Pro Tip: For an even more intense flavor, you could try using smoked bacon instead!

4. Chopped green onions

Green onions come with a mild onion flavor and add a nice color to the top of your casserole.

I like to first sauté them in olive oil until they’re just beginning to brown, then sprinkle them on my casserole as a finishing touch right before baking.

This adds an extra layer of crunchy texture and mild onion flavor that goes great with so many dishes.

Pro Tip: Add some sliced jalapeno peppers for even more zing!

5. Chopped bell peppers

Colorful, crunchy, and flavorful – chopped bell peppers are a great addition to any casserole dish.

I like to chop up my peppers into matchsticks as it gives them a nice bite, but you can also dice them for more uniformity.

Bell peppers give the dish an extra layer of flavor and texture that is hard to replicate with other ingredients.

Plus, they add some nutrition!

Pro Tip: To save time when prepping the bell peppers, use kitchen shears to quickly cut them into desired shapes.

6. Grated Parmesan cheese


As a cheese lover, I’m always looking for ways to add more flavor and depth to my casseroles.

Grated Parmesan cheese is a great way to do that!

I like to use the pre-grated kind, as it’s quick and easy. Sprinkle it over your casserole before baking for an extra nutty, salty kick.

Or try adding grated Parmesan after you’ve already cooked (or reheated) your casserole – this will give you a nice crunchy texture with all the cheesy goodness of Parmesan.

Pro Tip: To get the most out of your cheese, grate it yourself from a block of Parmigiano Reggiano for maximum flavor!

7. Toasted slivered almonds

If you have a bag of slivered almonds in your pantry, you’ll want to use them for your next casserole.

Toasting the almonds beforehand will give them an extra crunch and nutty flavor that can take any dish to the next level.

  1. I like to prepare my almonds by heating a skillet over medium-high heat, adding the slivered almonds, stirring frequently till they become golden brown.
  2. Once ready, sprinkle them on top of your casserole before baking it in the oven.

Pro Tip: To avoid burning your slivered almonds, keep a close eye on them and stir often!

8. Chopped black olives

halved black olives

I love olives – they add a savory and salty flavor to any dish, plus they are full of healthy fats.

Chopped black olives work perfectly as a topping for casseroles – they add texture, nutrition, and tons of flavor.

I like to toast them in a pan with some olive oil before adding them to the mix.

This helps bring out the nutty flavor from the olives and adds an extra layer of deliciousness to your casserole.

Pro Tip: If you want even more intense flavor, substitute regular olive oil for garlic-infused olive oil when you’re cooking your olives on the stovetop!

9. Dried cranberries

Oh my, the flavor that dried cranberries can give to a casserole is undeniable.

I like to prepare them by soaking them in hot water for about an hour, then draining and adding the softened cranberries to my dish.

Not only do they add a chewy texture, but also a wonderful sweet-tart flavor.

Plus, they look absolutely gorgeous when sprinkled over your favorite casserole.

Pro Tip: If you want a deeper flavor profile, try soaking your dried cranberries with some orange zest or orange juice!

10. Diced tomatoes

Chopped Tomatoes

I love a little freshness to my casseroles, so diced tomatoes are always a good choice.

  1. To prepare them for a casserole, I usually simmer them with some olive oil and garlic for about 10 minutes until they become soft.
  2. Once that’s done, you can add the diced tomatoes to your casserole and bake according to recipe instructions.

This will give you an amazing flavor boost in whatever dish you are making!

Pro Tip: For extra flavor, try adding fresh herbs like basil or oregano when simmering the tomatoes.

11. Cheddar

Cheddar Cheese

Nobody can deny that a good casserole needs cheese.

When I’m making my own, I like to use sharp cheddar for a nice kick of flavor.

It’s best grated on top just before baking so that it melts evenly and creates an even coating over the top of your dish.

If you’re looking for more texture and crunch, add some extra shredded cheese after taking your casserole out of the oven; this will give you a delicious cheesy crust!

Pro Tip: You can also mix some finely diced jalapenos into your shredded cheese for added heat and flavor!

12. Sliced mushrooms


Mushrooms add a certain earthiness and texture to your casserole that can’t be found in any other topping.

I like to sauté my mushrooms before adding them – this brings out the flavor more, instead of just having them as a raw topping.

If you’re looking for an extra burst of flavor, try brushing the tops with melted butter or olive oil before baking.

Pro Tip: Slice your mushrooms thinly so they cook evenly and don’t overpower the entire dish.

13. Chopped celery

chopped Celery

Cheap, easy, and versatile – chopped celery is one of my favorite toppings to add a bit more flavor and texture to any casserole.

I like to sauté it first in garlic, butter, and herbs like thyme or sage for a few minutes before adding it on top.

It’s amazing combined with melted cheese too!

And if you’re feeling adventurous, you can even combine the celery with cream cheese for an extra creamy topping that will definitely wow your friends (and family).

Pro Tip: To speed up the prep process even more, get pre-chopped celery from your local grocery store.

14. Chopped fresh herbs

fresh herbs chopped

I love fresh herbs as a topping for tuna casserole.

They really take the flavors of the dish to another level.

I usually chop up rosemary, thyme, oregano, and basil (you could even add parsley if you like).

Sprinkle some on top of your casserole before baking and you’ll have a delicious herbaceous flavor without overpowering it.

Pro Tip: To get the most out of your herbs, let them sit in olive oil for an hour or so before using them as a topping. This will help release all their flavor!

15. Chopped hard-boiled eggs

Chopped hard-boiled eggs

Lastly, for an extra flavor punch, I love adding chopped hard-boiled eggs to my casseroles.

  1. To prepare them, start with cold water and bring it to a boil.
  2. Once the water is boiling, add your eggs in for about 10 minutes before transferring them into cold water.
  3. After they’ve cooled off, peel off shells and chop them up!

You can sprinkle these over the top of your casserole or mix it in for an extra creamy texture.

Pro Tip: If you want some crunchy texture on top of your casserole, mix together breadcrumbs and melted butter before sprinkling on top of the dish!


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Tuna Casserole Toppings

15 Toppings For Tuna Casserole You Must Try

If you thought tuna casserole was a boring dish, think again! I'm here to show you 15 unique and delicious toppings that will make your tuna casserole anything but ordinary. From cheese and nuts to fresh herbs and vegetables, these toppings will add flavor and crunch to your casserole and make it an absolute treat. So get your taste buds ready, because your next casserole is sure to be a mouth-watering success.
Prep Time 5 minutes
Cook Time 5 minutes
Total Time 10 minutes
Course Main Course, Toppings
Cuisine American
Servings 4 people
Calories 344 kcal


  • Crushed potato chips
  • Toasted breadcrumbs
  • Chopped bacon bits
  • Chopped green onions
  • Chopped bell peppers
  • Grated Parmesan cheese
  • Toasted slivered almonds
  • Chopped black olives
  • Dried cranberries
  • Diced tomatoes
  • Cheddar
  • Sliced mushrooms
  • Chopped celery
  • Chopped fresh herbs
  • Chopped hard-boiled eggs


  • Pick your favorite topping from this list to add to your casserole.
  • Prepare the topping however you'd like.
  • Enjoy your meal in no time!
CEO at Happy Muncher | | Website | + posts

Hi, I'm Benjamin. I love cooking, long walks, and my girlfriend! Here you’ll find simple and delicious recipes that you can make in 30 minutes or less.