Preheat oven or toaster oven to 400°.
In a bowl, combine tuna, onion, celery, pepper and mayonnaise and stir gently.
Divide tuna mixture among 2 slices of bread. Sprinkle with cheese and top with remaining 2 slices of bread.
Bake for 10 to 15 minutes, or until warm, the cheese is melted and the bread is golden brown. Serve immediately.
Preheat oven or toaster oven to 400°.
In a bowl, combine tuna, onion, celery, pepper and mayonnaise and stir gently.
Divide tuna mixture among 2 slices of bread. Sprinkle with cheese and top with remaining 2 slices of bread.
Bake for 10 to 15 minutes, or until warm, the cheese is melted and the bread is golden brown. Serve immediately.
Thank you!