Season flour with salt and pepper
Dredge chicken breasts in flour mixture
Brown chicken in olive oil (approximately 3 minutes on each side)
Transfer to a 13 x 9" baking pan (keep warm)
Add shallots, broth, wine, tomato sauce and mushrooms to pan.
Bring to boil, then simmer 5 minutes.
Pour over chicken in baking pan and bake 15 minutes