Not-Your-Mother's Tuna Caserole

This is a recipe is from my church's cookbook, from a guy who's wife is a REALLY good cook!

1 box white Cheddar macaroni and cheese
1 tbsp. butter
1 small onion, finely diced
1 can solid white albacore tuna, drained
1/2 c. sharp cheddar cheese
1/2 c. crushed saltines
salt and pepper to taste

Preheat oven to 350

Prepare macaroni and cheese as per package directions. Meanwhile, saute onion in butter until translucent. Add tuna, breaking it up in the pan. Season with salt and pepper.

Add the tuna mixture to the macaroni and cheese. Put in casserole dish, top with cheese. Put in casserole dish; top with cheese and cracker crumbs. Bake until cheese is melted and topping crispy. Serves 4.