15-Minute Broiled Avocado Tuna Melts
Open-faced tuna melts featuring creamy yogurt-based tuna salad layered with fresh avocado and tomato, then topped with melted Swiss cheese. The combination of protein-rich tuna, heart-healthy avocado, and tangy yogurt creates a satisfying lunch that's lighter than traditional mayonnaise-based versions. Perfect for busy weekdays when you want something quick yet nutritious, these melts broil in just minutes for that perfect golden, bubbly cheese finish.
Ingredients
- 4 slices whole wheat bread
- 2 cans (5 oz each) chunk light tuna in water, drained
- 3 tablespoons whole milk plain yogurt
- ½ teaspoon salt
- ¼ teaspoon garlic powder
- ¼ teaspoon onion powder
- 1 avocado, peeled, pitted and sliced
- 1 medium vine-on tomato, thinly sliced
- 1 cup shredded Swiss cheese
Instructions
- 1
Move oven rack 4 to 6 inches from broiler and set oven control to broil
- 2
Toast bread slices lightly in toaster, then arrange in single layer on foil-lined cookie sheet
- 3
Stir together tuna, yogurt, salt, garlic powder and onion powder in medium bowl
- 4
Top each bread slice evenly with avocado, tomato and tuna mixture
- 5
Sprinkle each sandwich with cheese
- 6
Broil 3 to 4 minutes or just until cheese is melted
Tips
Use day-old bread for better structure that won't get soggy under the toppings
Pat avocado slices dry before layering to prevent excess moisture
Watch closely during broiling as cheese can go from melted to burnt quickly
Good to Know
Refrigerate assembled sandwiches up to 2 hours before broiling for best quality
Prepare tuna mixture up to 1 day ahead and refrigerate covered
Serve immediately while cheese is hot and melted
Common Mistakes
Use foil-lined baking sheet to avoid sticking and easy cleanup
Don't skip toasting bread first to prevent soggy bottoms
Substitutions
Dairy-Free Swaps
General Alternatives
FAQ
Can I make these without broiling?
Yes, bake at 400°F for 8-10 minutes until cheese melts, though you won't get the same golden top.
What if I don't have Swiss cheese?
Any good melting cheese works - try cheddar, provolone, or mozzarella for different flavor profiles.
How long will leftover tuna mixture keep?
Store covered in refrigerator up to 3 days, but add fresh avocado when serving for best texture.