INGREDIENTS
1 lb
Cremini or white button mushrooms
4 oz
French fried onions
1 1/2
lbs Green beans
1
Onion
4 tbsp
All-purpose flour
1/2 tsp
Black pepper, freshly ground
2 tsp
Salt
2 tsp
Sherry vinegar or red wine vinegar
4 tbsp
Butter, unsalted
2 1/2 cups
Half-and-half
1/2 cup
Parmesan, grated