One of Mom's specialties!
Dust 4 half chicken breasts lightly with flour and sauté in a heavy skillet in 4 T. butter and 2 T. oil until browned on all sides.
Remove, spread each piece liberally with mustard and put in shallow baking dish.
In fat in pan, sauté 1 finely chopped onion for a few minutes.
Add and sauté 1/2 C. sliced mushrooms.
Add 2 T. chopped parsley, salt and pepper to taste.
Then blend in 1 C. heavy cream and let heat just through.
Pour mixture over chicken and bake in 350 oven for 30-35 min. or till tender.
Taste to see if sauce needs more salt and add a few drops of lemon juice.
Serve immediately with rice.