-
Cook mushrooms in 2 tbsp butter in a large skillet, stirring constantly, just until tender.
-
Remove from heat; set aside. Cut each chicken breast half in half lengthwise. Place each piece of chicken between two sheets of wax paper; flatten to 1/8" thickness, using a meat mallet or rolling pin.
-
Dredge chicken pieces in flour.
-
Place 5 or 6 pieces of chicken in 1 to 2 tbsp butter in a large skillet; cook over medium heat 3 to 4 minutes on each side or until golden.
-
Place chicken in a lightly greased 13x9" baking dish, overlapping edges.
-
Repeat procedure with remaining chicken and butter.
-
Reserve pan drippings in skillet. Sprinkle reserved mushrooms over chicken.
-
Add wine and broth to skillet. Bring to a boil; reduce heat, and simmer, uncovered, 10 minutes, stirring occasionally.
-
Stir in salt and pepper.
-
Pour sauce over chicken.
-
Combine cheeses and green onions; sprinkle over chicken.
-
Bake uncovered at 450 for 12 to 14 minutes.
-
Broil 5 1/2" away from heat 1 to 2 minutes or until browned.