Chicken and Artichoke Casserole

1/2 lb. fresh mushrooms, sliced
2 T butter
2 14 oz cans chicken broth
5 chicken breasts
1 14 oz can artichoke hearts, drained
3/4 stick butter
1/3 c flour
1/2 tsp salt
1/4 tsp pepper
1 1/8 cup half and half
3/4 cup shredded Parmesan cheese
1/2 tsp dried rosemary

Saute mushrooms in 2 T butter and set aside. Pour 2 cans chicken broth in large pot and add water to cover chicken breasts. Bring to a boil. When chicken is cooked through, shred with two forks. Remove from broth and save 1 1/8 cups. Cool. Arrange chicken in casserole dish. Top with artichoke hearts (I like to chop them into smaller pieces.) Set aside. Melt 3/4 stick butter, stir in flour, salt and pepper and cook until smooth, about 1 minute. Gradually stir in 1 1/8 cup reserved chicken broth and light cream. Cook and stir as mixture boils and thickens. Blend in Parmesan cheese and rosemary. Pour over artichokes. Sprinkle mushrooms over the top. Bake at 325 for 30 minutes and serve over rice. If you have more Parmesan, sprinkle it on top just before baking. This recipe freezes well- just wrap tightly in plastic wrap and freeze before you bake it.