On a clean work surface, lay out prosciutto slices. Top slices with basil leaves and sprinkle evenly with mozzarella. Starting with the short end, roll up each prosciutto slice.
Flatten chicken breasts with a rolling pin or meat mallet. Dip each breast in milk and then dredge in breadcrumbs. Roll breaded chicken breast around prosciutto, securing together with toothpicks.
Place chicken in 13x9 baking dish. Pour wine & chicken broth over chicken. Dab ½ tsp of butter or margarine on the top of each breast.
Bake at 400°F for 40 minutes or until done.