INGREDIENTS
12 oz
Cremini mushrooms, small stems
2
lbs Green beans
1
Yellow onion, small dice (about 1 1/2 cups), medium
1/3 cup
All-purpose flour
1
Black pepper, Freshly ground
1 1/2 tsp
Kosher salt
1 1/2 cups
Panko breadcrumbs
9 tbsp
Butter, unsalted
4 cups
Whole milk