Noodle Casserole

Recipe is from Mazie.

White sauce:
3 TB butter
2 TB flour
1 ½ cup milk
1 tsp salt
¼ tsp pepper
½ tsp paprika
½ lb American cheese, grated
1 (4-oz) can mushrooms, drained and chopped
1 (7-oz) can tuna, flaked
4 oz noodles, cooked and drained

Make white sauce: Melt butter in small saucepan. Add flour and stir. Add milk, salt, pepper, and paprika and stir over medium heat until thick. Add cheese to hot white sauce. Cook noodles and arrange noodles, tuna, and mushrooms in layers in buttered baking dish. Cover with white sauce and bake 25 minutes at 350 degrees.