- 2 tablespoons unsalted butter
- 2 tablespoons all-purpose flour
- 1 1/2 cups whole milk
- 1/4 teaspoon salt
- 1/8 teaspoon white pepper
- Pinch of ground nutmeg
- 1 cup grated Gruyere cheese
Melt the butter in a saucepan over medium heat.
Add the flour and whisk constantly for 1-2 minutes until the mixture is smooth and bubbly.
Slowly add the milk, whisking constantly to prevent lumps from forming.
Add the salt, white pepper, and nutmeg and continue to cook the sauce for about 5 minutes, stirring occasionally, until it has thickened and coats the back of a spoon.
Add the grated Gruyere cheese to the sauce and stir until the cheese has melted and the sauce is smooth.
Taste the sauce and adjust the seasoning as needed with additional salt, pepper, or nutmeg.