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Export 6 ingredients for grocery delivery
Step 1
In a large skillet, melt the butter over medium high heat. Sprinkle in the flour while whisking to create a paste. Cook for 1 minute until the mixture begins to brown.
Step 2
While whisking, add the milk and allow the sauce to thicken.
Step 3
Add the mustard, Parmesan, kosher salt, and pepper.