1 tbsp. cornstarch
1 cup heavy cream
3/4 cup chicken broth
3/4 cup marsala wine
1 cup sliced onions
1-1/2 cups sliced mushrooms
2 tbsp. minced garlic
1/2 tsp. oregano
1/2 tsp. garlic salt
1/2 tsp. pepper
1/2 cup flour
2 tbsp. unsalted butter
4 boneless skinless chicken breast