1/2 lb. ground chuck
1/4 c. chopped onion
1 2/3 c. prepared spaghetti sauce with mushrooms (15 oz. can)
6 oz. spaghetti
2 tbsp. butter
4 tbsp. flour
1/4 tsp. salt
3/4 c. undiluted Carnation evaporated milk
1/3 c. water
1 c. shredded process American cheese
2 tbsp. grated American cheese

Brown chuck and onion in frying pan; drain. Add sauce, simmer 10 minutes. Break spaghetti noodles into thirds; cook according to package; rinse and drain. Mix noodles and sauce.

Melt butter in small saucepan; stir in flour and salt; slowly add milk and water. Cook over medium heat; stir constantly until thickened. Add 1/2 cup American cheese. Stir until melted.

Spread 1/2 spaghetti mixture in bottom of 10 x 6 x 2 inch baking dish. Spoon all of cheese sauce over mixture and add remaining spaghetti sauce. Top with 1/2 cup American cheese. Bake at 350 degrees for 15-20 minutes.