How can I make a creamy mac and cheese sauce without using flour?

To make a creamy mac and cheese sauce without using flour, you can use a combination of milk, cheese, and butter. Start by melting butter in a saucepan, then slowly whisk in milk until it's heated but not boiling. Gradually add shredded cheese of your choice, stirring until it melts and the sauce becomes creamy. Adjust the consistency by adding more milk if needed.