Tuna Melts with Sliced Avocado and Tomato

This is something one could easily come up with by themselves, but I like having notecards with these kinds of recipes for those days when my brain is foggy. :)  Thank you to Six O'Clock Scramble for this one!

Preheat: 350*
Category: Sandwich, Tuna

2 6-oz. cans Chunk tuna, drained
1-2 T. Mayonaisse, to taste
1 stalk Celery, finely diced
4 slices Sourdough bread
1 ripe Avocado, peeled and thinly sliced
1 ripe Tomato, thinly sliced
4 slices Muenster cheese

1.  Mix tuna, mayo, celery thoroughly with a fork.

2.  Lightly toast the bread. Spread 1 scoop of tuna on the bread, topping it with slices of avocado, tomato and one thin slice of cheese.

3.  Bake at 350* for about 5 minutes on a foil-lined baking sheet.  Cheese should be melted.