INGREDIENTS
2 1/2 tbsp
unsalted butter (softened)
1 tbsp
minced yellow onion
2 tsp
good quality Dijon mustard
1/2 tsp
course salt
cayenne pepper
nutmeg
1 tbsp
all purpose flour
1
carton of button mushrooms with stems removed
1/2 cup
heavy cream
1 tsp
white pepper