Drain the tuna and place it in a large bowl. Add the diced tomatoes, onion, celery, mayonnaise, Worcestershire sauce, garlic powder, and pepper. Mix until everything is combined.
Pour the mixture into a greased 8x8-inch baking dish.
Sprinkle the cheddar cheese and crushed crackers on top.
Bake for 20-25 minutes or until the top is golden brown.
Serve and enjoy!
Interesting Facts
This casserole is a great way to use up leftover canned tuna.
This dish can be made ahead of time and refrigerated until ready to bake.
This casserole can be served with a side salad or vegetables.