Gather all ingredients.
Melt butter in a saucepan over medium heat; add flour and whisk continuously until mixture turns golden and forms a smooth paste.
Add milk and stir with a wooden spoon until mixture thickens, about 3 to 5 minutes.
Add Cheddar cheese and stir until cheese is melted, about 2 to 3 minutes more.
Season with salt and pepper. Serve and enjoy!
