Ingredients

2 tablespoons unsalted butter 

1/2 shallot, finely diced (2 tablespoons) 

2 tablespoons all-purpose flour 

3/4 cup whole milk 

1/4 cup finely grated Parmesan 

Coarse salt and freshly ground pepper 

Preparation

Heat butter in a small saucepan over medium heat. Add shallot; cook, stirring occasionally, until tender, about 2 minutes. Add flour and cook, stirring, 1 minute. Slowly add milk and cook, stirring, until thickened, about 2 minutes. Remove from heat, add Parmesan, and season with salt and pepper.