Cook macaroni noodles according to package instructions, drain, and set aside

In the same pot you cooked the noodles in, melt butter (make sure heat is on low)

Add flour and whisk quickly to combine with flour, making sure not to burn (remove from heat if necessary)

Add heavy cream and milk and whisk mixture on medium heat until it starts to thicken

Once mixture starts to thicken, add cheese and salt and stir until cheese melts

Add noodles in and stir well, remove from heat

Serve with optional freshly ground black pepper, to taste