Step 1

In a saucepot over medium heat, melt the butter. Stir in the flour and cook until the mixture bubbles.

Step 2

Whisk in the chicken stock and the milk until smooth. Add the celery and cook, stirring constantly until the mixture thickens to a sauce consistency, about 10 to 15 minutes.

Step 3

Stir in the Parmesan cheese, salt, and pepper. Taste and adjust seasoning.

Step 4

Use in your recipe or chill completely before storing in an airtight container in the freezer until ready to use.