Cheddar Tuna Casserole

Ingredients

1/2 cup onion, chopped
2 Tbsp butter, or margarine
1 can (10-3/4oz.) condensed cream celery soup
1/3 cup milk
2 cups (4 oz.) noodles, cooked, drained
1 can (6-1/2 oz.) tuna, drained, flaked
1 cup KRAFT Sharp Cheddar Cheese, shredded, divided
1/4 cup KRAFT Grated Parmesan Cheese
2 Tbsp pimento, chopped, (optional)

Directions

Cook and stir onion in butter in large saucepan on medium heat until tender.
Add soup, milk, noodles, tuna, 1/2 cup of the cheddar cheese, Parmesan cheese and pimento; mix well.
Spoon into 1-quart casserole.
Bake at 350F for 30 minutes.
Top with remaining 1/2 cup cheddar cheese.
Bake an additional 5 minutes or until melted.