French Onion Chicken Casserole
"There are baguette slices hiding in this casserole!..."
INGREDIENTS
•
5 tbsp.
•
salted butter, plus more for the baking dish
1
•
10-ounce package cremini mushrooms, thickly sliced
5
•
medium onions, thinly sliced
1 tbsp.
•
fresh thyme, chopped
1/2 tsp.
•
kosher salt
Black pepper, to taste
2 tbsp.
•
all-purpose flour
1/2 c.
•
dry white wine
3 c.
•
low-sodium beef broth
2 c.
•
chopped rotisserie chicken (skin removed)
1
•
long baguette, sliced 1/2 inch thick
2 1/2 c.
•
shredded gruyère cheese (about 10 ounces)
1/2 c.
grated parmesan cheese
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