Instructions: Combine mustard, tarragon, chives, salt, and pepper. Spread on chicken breasts. Wrap strip of proscuitto around each. Place rack in bottom of slowcooker. Top with wrapped chicken and onions. Combine wine and chicken broth; pour over chicken. Cover and cook on LOW 5 to 6 hrs. or until chicken is tender. Remove chicken and rack; cover and keep warm. Turn pot on HIGH. Pulverize croutons in food processor until they look like brown sugar. Stir into broth mixture. Cover and cook on HIGH 15 to 20 mins. or until thickened. Spoon over cooked chicken breasts. To make a very smooth sauce, process thickened broth in food processor just before spooning over chicken.

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