Sauteed Chicken Breasts Stuffed with Cheese and Ham

Name: Sauteed Chicken Breasts Stuffed with Cheese and Ham
Ingredients: 4 (6- to 8-ounce) skinless boneless chicken breast halves; 4 thin slices cooked ham (1/4 pound); 4 thin slices Swiss cheese (3 ounces); 1 large egg, lightly beaten; 1 teaspoon salt; 1/4 teaspoon black pepper; 3 tablespoons unsalted butter; 1/3 cup all-purpose flour; 1 pound small mushrooms, trimmed and quartered; 1 teaspoon finely chopped shallot; 1/3 cup dry white wine; 1 pound tomatoes, peeled, seeded, and diced; 1 cup heavy cream; Garnish: finely chopped fresh flat-leaf parsley; Accompaniments: watercress; cooked rice topped with truffle slices