Gruyère, Arugula, and Prosciutto-Stuffed Chicken Breasts with Caramelized Shallot Sauce

Ingredients
Chicken:
6 (4-ounce) skinless, boneless chicken breast halves
6 (1/2-ounce) slices prosciutto
6 (1/2-ounce) slices Gruyère cheese
1 1/2 cups trimmed arugula
1/2 teaspoon salt
1/2 teaspoon black pepper
3 tablespoons all-purpose flour
1 tablespoon olive oil

Sauce:
1 cup thinly sliced shallots
2 teaspoons tomato paste
2 cups dry white wine
2 1/4 cups fat-free, less-sodium chicken broth
1 1/2 teaspoons water
1 teaspoon cornstarch

Preparation
Preheat oven to 350°.

To prepare the chicken, place each chicken breast half between 2 sheets of heavy-duty plastic wrap (I use a large ziploc bag;) pound to 1/4-inch thickness using a meat mallet or rolling pin. Discard plastic wrap. Top each chicken breast half with 1 slice prosciutto, 1 slice cheese, and 1/4 cup arugula, leaving a 1/4-inch border around edges. Fold in half, pinching edges together to seal; sprinkle with salt and pepper.

(The chicken can be prepared up to a day ahead and refrigerated at this point. Stuffing the chicken a day ahead and refrigerating it makes it easier to sauté.)

Dredge chicken in flour, shaking off excess. Heat oil in a large nonstick skillet over medium-high heat. Add chicken; cook 5 minutes on each side. Place chicken in a shallow baking pan; bake at 350° for 5 minutes or until done. Keep warm.

To prepare sauce, add shallots to skillet; sauté 4 minutes over medium-high heat or until browned. Add tomato paste; cook 1 minute, stirring constantly. Stir in wine; bring to a boil over high heat. Cook until reduced to 1 cup (about 6 minutes). Add broth; bring to a boil. Cook until reduced by half (about 8 minutes). Combine water and cornstarch in a small bowl, stirring with a fork until smooth. Add cornstarch mixture to sauce; bring to a boil. Cook 1 minute, stirring constantly.

Yield 6 servings (serving size: 1 chicken breast half and about 1/4 cup sauce)