"Goes where no turkey has gone before...."
panko
freshly grated Parmesan, divided
butter, divided, plus more for pan
Kosher salt
small yellow onion, chopped
sliced cremini mushrooms
all-purpose flour
low-sodium chicken stock
shredded cheddar
cubed cooked turkey
egg noodles, cooked
frozen peas
freshly chopped parsley, plus more for garnish
lemon juice
Freshly ground black pepper