Step 1

In a small pot, over medium heat, melt butter. Whisk in flour and cook, whisking continuously, until flour is lightly golden, about 1 minute.

Step 2

Slowly pour in milk, whisking out any lumps as they form. Continue to whisk the mixture until it is thick and bubbly, 3 to 4 minutes.

Step 3

Remove from heat, stir in the cheese a handful at a time until all the cheese has been used and sauce is smooth and creamy. Add cayenne, salt, and pepper to taste.

Step 4

Serve immediately and enjoy!