Here is the version of Cheesy Spaghetti that my mom made when I was a child.
Cheesy Spaghetti Bake
½ lb. ground beef
¼ cup chopped onion
15 oz. jar prepared spaghetti sauce
6-7 oz. spaghetti noodles
2 tablespoons butter
1 tablespoon flour
¼ teaspoon salt
¾ cup evaporated milk
1/3 water
1 cup shredded cheese, divided
Brown ground beef and onion in skillet; drain. Add spaghetti sauce and simmer ten minutes. Break spaghetti into quarters and measure 1½ cups. Cook spaghetti according to package directions. Rinse and drain. Mix spaghetti and sauce. Melt butter in saucepan and stir in flour and salt. Add evaporated milk and water. Cook over medium heat until slightly thickened, stirring constantly. Add ½ cup shredded cheese, stir until melted. Spread ½ spaghetti mixture in bottom of 10x6x2 inch baking dish. Top with all of cheese sauce. Add remaining spaghetti mixture and ½ cup shredded cheese. Bake in 350º oven for 15-20 minutes or until piping hot. Makes 6 Servings.