This high-protein tuna avocado spread is my go-to when I need a fast, filling breakfast that still feels fresh. You mash avocado with lemon, then fold in tuna, chopped egg, crunchy cucumber, and herbs for a creamy-but-textured spread that’s great in a toasted sourdough sandwich with cheddar. It’s especially handy for work mornings because you can make the spread ahead and assemble when you’re ready. For a quick overview of the flavor profile and basic method, see this tuna avocado breakfast spread as a reference point.
Why This Recipe Is Helpful
- High-protein and satisfying, thanks to tuna and eggs paired with healthy fats from avocado.
- Quick assembly: the spread takes about 10 minutes if your eggs are already boiled.
- Easy to meal-prep: make the spread once and use it for a couple of breakfasts.
Best For
Anyone who likes savory breakfasts and wants something more filling than toast alone, especially busy commuters and work-from-home mornings.
Be Careful If
This includes fish, eggs, and dairy (cheddar), so it’s not suitable for those allergies or sensitivities. It’s also fairly rich from avocado and mayo, so lighter appetites may prefer a thinner layer.
Ingredients
- 1 ripe avocado (about 7–8 oz / 200–225 g)
- 1/2 lemon, juiced (about 1–1 1/2 tbsp / 15–22 ml)
- 5 oz (140 g) yellowfin tuna, drained
- 2 hard-boiled eggs, chopped
- 1/3 cup (35–40 g) finely chopped cucumber
- 1/4 cup (35–40 g) diced red onion
- 2 tbsp chopped fresh herbs (about 6–10 g; cilantro, parsley, or dill)
- 1 tsp (5 g) Dijon mustard
- 1/2 tsp (1–2 g) garlic flakes
- 1/4 tsp red chili flakes
- Salt, to taste
- 1 tbsp (15 g) avocado mayo
- 2 slices sourdough bread (about 3–4 oz / 85–115 g total)
- Cheddar cheese, sliced (about 1–2 slices / 20–40 g)
Ingredient Notes
- Avocado: Use a ripe one that yields to gentle pressure; under-ripe avocado stays chunky and won’t mix smoothly.
- Tuna: Drain well so the spread doesn’t get watery; press it lightly with the lid before adding.
- Herbs: Dill is extra good with tuna; parsley keeps it clean and mild; cilantro gives a brighter edge.
- Avocado mayo: Regular mayo works too; the lemon helps keep the flavor fresh.
Kitchen Tools Needed
- Mixing bowl
- Fork (for mashing)
- Knife and cutting board
- Spoon or spatula
- Skillet or panini press (or toaster plus skillet)
Step-by-Step Instructions
- Mash the avocado. In a mixing bowl, add the avocado and lemon juice. Mash with a fork until mostly creamy with a few small chunks (your choice).
- Mix the spread. Add drained tuna, chopped hard-boiled eggs, cucumber, red onion, herbs, Dijon mustard, garlic flakes, chili flakes, a pinch of salt, and avocado mayo. Mix until evenly combined. Taste and adjust salt and lemon if needed.
- Prep the bread. Lightly toast one side of each sourdough slice (in a dry skillet over medium heat or in a toaster).
- Add the cheese. Place cheddar on the toasted side of one slice while it’s still warm so it starts to soften.
- Assemble. Spoon the tuna avocado mixture over the cheese (don’t overstuff—aim for an even layer so it warms through). Top with the second slice of bread, toasted side facing in.
- Toast the sandwich. Heat a skillet over medium. Toast the sandwich 3–4 minutes total, flipping once, until the bread is crisp and the cheddar is melted. Press gently with a spatula for better contact and browning.
- Serve. Rest for 1 minute, then slice—this helps keep the filling from sliding out.
Pro Tips
- If your spread tastes “flat,” it usually needs more salt or a squeeze more lemon, not more mustard.
- Chop the cucumber and onion quite small so the sandwich slices cleanly and doesn’t fall apart.
- For maximum melt, cover the pan for the last 30–60 seconds to trap heat and help the cheese soften.
- If your tuna is very flaky, mix gently so you keep some texture instead of turning it paste-like.
Lighter Swaps
- Use one slice of cheddar instead of two, or choose a thinner slice.
- Swap avocado mayo for plain Greek yogurt (same amount) for a tangier, lighter spread.
- Open-face it: serve the spread on one slice of sourdough and skip the top slice.
Common Mistakes
- Not draining the tuna well, which makes the spread watery and the bread soggy.
- Using under-ripe avocado, which won’t mash smoothly and tastes bland.
- Heat too high in the pan, which burns the bread before the cheese melts.
Serving Suggestions
Serve with extra cucumber slices, cherry tomatoes, or a handful of arugula on the side for a quick, crunchy balance.
Storage Instructions
Store leftover tuna avocado spread in an airtight container in the fridge for up to 3 days; press plastic wrap directly on the surface to reduce browning.
Reheating Tips
The spread is best cold or room temp; if you’ve already built a sandwich, re-toast gently on medium-low so the bread crisps without drying out the filling.
Nutrition Estimate
Per serving (1 sandwich):
Calories: ~620
Protein: ~42 g
Carbs: ~40 g
Fat: ~33 g
Values are estimates and may vary by ingredients and portion size.
Recipe Summary
Prep Time: 10 minutes
Cook Time: 6–8 minutes
Total Time: 16–18 minutes
Servings: 1 sandwich (about 2 cups / 450–500 ml spread total, enough for 2 sandwiches depending on filling)
Cuisine: American-inspired
Course: Breakfast
Calories: ~620
Frequently Asked Questions
Can I make the spread the night before?
Yes. It actually holds up well overnight. For the best color, press plastic wrap onto the surface and keep it tightly covered.
What’s the best bread for this besides sourdough?
Any sturdy bread works—whole grain or a thick sandwich bread is ideal. Softer white bread can get squished once the spread is added.
Can I skip the cheese?
Absolutely. The spread is flavorful on its own; if you skip cheese, you may want an extra pinch of salt or herbs to keep it punchy.
Conclusion
This tuna avocado breakfast sandwich is fast, hearty, and packed with protein without feeling heavy or fussy. Make the spread once, and you’ve got an easy, savory breakfast ready when you are.