4 tablespoons unsalted butter, softened
1 onion, finely chopped
1/2 pound shiitake mushrooms, stemmed, caps thinly sliced
2 carrots, thinly sliced
Salt and freshly ground pepper
3 tablespoons all-purpose flour
1 teaspoon sweet paprika
1 cup chicken stock or low-sodium broth
2 tablespoons Madeira
2 cups whole milk
3 cups shredded chicken (from a rotisserie chicken)
1/2 cup frozen baby peas
Eight 1-inch-thick slices of bakery white country bread (about 1 pound), crusts removed