Chicken Proscuitto with Mushroom Sauce Recipe

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CHICKEN PROSCIUTTO WITH MUSHROOM SAUCE Ingredients 3  whole chicken breasts, skinless, deboned 5  tbsp butter 1 cup grated Swiss cheese 1/4 onion, finely chopped 1/4 cup all purpose flour 2  tablespoons Dijon mustard 1 cup chicken broth 1 cup half and half 1/4 cup white wine (or you can substitute 1 tbsp white wine …