Chicken Marsala Recipe

This recipe is from Food.com, except it's served on spaghetti instead of fetuccini. Source: http://www.food.com/recipe/copycat-recipe-for-carrabbas-chicken-marsala-50979

Ingredients for 4 servings:
4 tablespoons butter
4 boneless skinless chicken breast halves
4 shallots, chopped fine
1/2 lb mushroom, sliced
1/4 cup dry marsala
1/2 cup heavy cream
1 teaspoon lemon juice

Directions
Pound