This Mornay Sauce recipe is quick, easy and delicious. It’s a great substitute for hollandaise sauce.

Simple Mornay Sauce

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Course: Sides
Cuisine: French
Prep Time: 10 minutes
Cook Time: 10 minutes
Total Time: 20 minutes
Degree of Difficulty : Easy
Servings: 4 people


  • 1 tbsp unsalted butter
  • 1 tbsp all-purpose flour
  • 1 cup milk
  • 1 tbsp Dijon mustard
  • 1 tsp white pepper ground
  • 1/2 cup grated Gruyere cheese
  • kosher salt to taste


Gather all ingredients before starting the recipe.

  • Melt 1 tbsp unsalted butter in a medium sauce pan over medium heat. Add 1 tbsp all-purpose flour and stir to combine, cook until the roux starts to bubble.
  • Add 1 cup milk and stir with a wire whisk as you are adding in the milk. Once it is combined, bring the sauce to a fast simmer and continue to stir with a wooden spoon until the sauce becomes thick.
  • Grate 1/2 cup grated Gruyere cheese and add to the sauce with 1 tbsp Dijon mustard and 1 tsp white pepper. Stir to combine.

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