Once all the milk is added, keep stirring, and bring the sauce to a gentle boil. Reduce the heat and simmer gently for 5 minutes. Season with salt and pepper. Stir in cheese and allow to melt.
This is a great go-to cheese sauce recipe; you can use different ... Place two saucepans on a medium heat. Pour the milk into one of the pans and melt the butter in the other.