1 stick butter
1/2 c. flour
1 tsp. salt
2 c. milk
1 (10 oz.) pkg. sharp Cheddar cheese

Melt butter. Remove from heat, stir in flour and salt until it is smooth. Slowly stir in 2 cups milk, until well blended. Return to heat. Add cut up cheese, stir until this all comes to boil and is thick. Remove from heat.