Scalloped Potato and Tuna Casserole

Scalloped Potato and Tuna Casserole
From Kitchen Magic

3 tbsp butter
2 tbsp minced onion
3 tbsp unbleached flour
1 tsp salt
2 cups milk
1/4 cup plain yogurt
2 seven-ounce cans of tuna, drained and flaked
3 cups thinly sliced potatoes
Minced fresh or dried parsley

Heat the butter in a saucepan and saute onion about five minutes. Blend in flour and salt. Gradually add milk and yogurt over medium heat and cook until thickened. Stir in tuna.

Put potatoes in a greased 6″ x 2″ x 10″ casserole dish. Pour the tuna mixture over it. Cover and bake at 350 degrees for one hour. Uncover and bake another 30 minutes or until potatoes are tender. Garnish with parsley. Makes four servings.