This is a recipe that I got from my aunt. It's no-fail and is delicious.
If you buy whole chickens and use them to make chicken stock, this is a good use for the chicken meat (instead of using chicken breasts, just use an equivalent amount of any chicken meat). You can hide dark meat in this recipe pretty easily.

Breast of Chicken Magnifique

4 chicken breasts

¼ cp butter

2 cp sliced mushrooms

2 cans cream of chicken soup

generous dash thyme

1/8 tsp crushed rosemary

½ cp sour cream

Brown chicken in butter. Remove. Brown mushrooms. Stir in soup and seasonings. Add chicken.

Cover. Cook over low heat for 45 minutes, stirring occasionally. Blend in sour cream, heat slowly.

Serve with wild rice and slivered almonds.