Gluten-Free Tuna Salad Sandwich Filling Recipe

This easy gluten-free tuna salad filling is one of those no-fuss, make-it-in-minutes recipes that becomes a regular in your lunchbox routine. It’s creamy, mild, high in protein, and – most importantly – it actually holds up in gluten-free bread without going soggy.

Whether you pop it into a sandwich, wrap, or even a gluten-free sandwich skewer, this tuna salad is a simple, safe, and tasty option for kids and adults alike.

Why This Tuna Salad Filling Works for Kids’ Lunches

Not all tuna salads are created equal. Some are too wet, some too strong in flavour, and many are packed with ingredients kids won’t touch (we’re looking at you, pickles and red onion). This version is smooth, mild, and flexible – designed with little palates in mind.

Here’s why it’s perfect:

• Nut-free and school-safe
• Mild flavour, no overpowering ingredients
• Creamy but not soggy
• High in protein to keep kids fuller for longer
• Easy to prep and customise
• Works in sandwiches, wraps, or gluten-free sandwich skewers

Ingredients To Make GF Tuna Salad Filling

Makes enough for 2 gluten-free sandwiches:

• 2 x 95g can tuna in springwater or olive oil, drained well
• 2½ tbsp whole egg mayonnaise (check it’s gluten-free)
• 2 tbsp corn kernels or finely diced celery
• Salt and pepper to taste
• Optional: squeeze of lemon juice for freshness
• Optional: lettuce or baby spinach to layer

How To Make Tuna Salad Sandwich Filling

• In a small bowl, flake the tuna with a fork.
• Mix in mayonnaise and corn or celery until well combined.

• Season with salt and pepper. Add a squeeze of lemon juice if using.
• Butter gluten-free bread, add lettuce leaves if using, and spread the tuna mix on top.

Variations to Try

This tuna salad is super versatile and easy to adapt depending on what you have on hand.

Add-ins & Swaps:

• Swap mayo for half Greek yogurt for a lighter, higher-protein version
• Add grated cheese for creaminess
• Mix in mashed avocado instead of mayo for a dairy-free option
• Try grated carrot or chopped cucumber (patted dry) for crunch
• Stir in sweetcorn and a little cheese for a tuna melt vibe
• Add chopped hard-boiled egg for a tuna-and-egg combo

How to Serve:

• As classic gluten-free sandwiches
• In mini rolls or tortilla wraps
• On gluten-free crackers or rice cakes
• In lettuce cups for a low-carb option
• Threaded onto sandwich sticks or skewers for a fun lunchbox twist
• Add to a gluten-free sandwich platter for picnics or playdates

Storage Tips

• Store tuna salad in an airtight container in the fridge for up to 2 days
• For best results, assemble sandwiches in the morning – not the night before
• If making ahead, store the filling and bread separately to avoid sogginess
• Add lettuce to prevent moisture reaching the bread
• Pack with a freezer brick or frozen yoghurt pouch to keep cool until lunch

Tips for Gluten-Free Sandwich Success

• Toast or lightly grill the bread to make it sturdier
• Add a lettuce or cheese layer between the filling and the bread
• Pack sandwiches tightly to help them hold together
• Try mini sandwich versions if your child prefers bite-sized options
• Use wraps, rolls, or firm loaves that hold up well when chilled

Frequently Asked Questions – Tuna Salad Sandwiches

Can kids eat tuna salad in lunchboxes?

Yes, mine do! This version is made with mild ingredients and no strong flavours, making it a great high-protein choice for school. It’s nut-free and of course gluten-free too.

How do I make tuna salad without mayo?

You can use plain Greek yogurt, mashed avocado, or a dairy-free spread as a substitute. The key is to keep the texture creamy, not watery.

Can I make tuna salad the night before?

Yes, but it’s best to assemble the sandwich in the morning. Store the tuna filling in the fridge overnight and combine with bread just before packing to avoid sogginess.

What gluten-free bread works best with tuna salad?

Use firm gluten-free loaves, wraps, or mini rolls. Toasting or letting the bread cool completely before assembling helps prevent it falling apart.

How can I make this recipe more filling?

Add chopped egg, cheese, or swap some mayo for Greek yogurt to boost protein and staying power. Pair with crackers, fruit, or a gluten-free muffin for a full lunch.

More Gluten-Free Sandwich Ideas:

• Gluten-Free BLAT (Bacon, Lettuce, Avocado, Tomato) Sandwich
• Gluten-Free Egg Salad Sandwich Filling Recipe
• Chicken Salad Sandwich Filling Recipe (Gluten-Free, Nut-Free)
• Gluten-Free Curried Egg Sandwich Filling Recipe