I start by melting butter in a pan over medium heat. Once it melts, I add garlic and cook for about 1 minute until fragrant.

Next, I add flour and whisk continuously for about 1–2 minutes. This helps create a smooth base (called roux).

Now slowly pour in the milk while whisking to avoid lumps. Keep stirring until the mixture thickens.

I then add grated Parmesan cheese and stir until it melts completely into the sauce.

Finally, I add salt, pepper, and a pinch of nutmeg. Give it a taste and adjust seasoning if needed.