Cheesy Tuna Macaroni Casserole

Southern Living; I am not real crazy about this one, but my kids love it.

• Ready In: 50 mins
• Serves: 4-6

Ingredients

• 1 (7 1/4ounce) package  macaroni & cheese dinner mix
• 1 (6 ounce) can tuna, drained and flaked
• 1 (10 1/2ounce) can  cream of celery soup
• 1⁄2 cup milk
• 1  tablespoon  chopped onion

Directions

1. Prepare macaroni and cheese dinner according to package directions.
2. Mix together remaining ingredients in a large bowl.
3. Stir in macaroni and cheese.
4. Spoon tuna mixture into a lightly greased 1 1/2 quart baking dish.
5. Bake at 350 degrees for 18-20 minutes or until lightly browned.