Drain the canned tuna and place it in a mixing bowl. Dice fresh jalapeños and add them along with shredded sharp cheddar cheese and mayonnaise. Gently mix until combined but still chunky.

Select your type of bread and slice it accordingly. Lay the bread slices on a baking sheet lined with parchment paper.

Generously spoon the tuna filling onto each slice of bread, spreading evenly. Optionally, sprinkle additional cheddar cheese and jalapeño slices on top.

Preheat the oven to 400°F (200°C) and bake the melts for 7 to 9 minutes, until the cheese is melted and the bread is golden.

For a crispier texture, broil the melts for an additional 2 to 3 minutes, watching closely to avoid burning.

Once baked, let the melts cool slightly and serve warm with fresh vegetables or potato chips.