01 -
Place a small saucepan over medium heat and melt the butter completely.
02 -
Add finely chopped garlic to the melted butter. Stir and cook for about 30 seconds until fragrant, avoiding browning.
03 -
Sprinkle the flour, ground black pepper, salt, and dried oregano into the pan. Continuously whisk until a smooth paste forms. Cook the roux for 1–2 minutes to eliminate the raw flour taste.
04 -
Slowly pour in the milk while whisking constantly. Continue stirring until the sauce thickens and achieves a smooth consistency.
05 -
Remove the pan from heat and stir in the grated Parmesan cheese until fully melted and the sauce becomes creamy. Use immediately or cool and store in a sealed container.