Salt and Pepper both sides of the chicken breats.
Dip chicken in flower and coat both side.
Shake off any extra flour.
Heat oven to 375°F
Place chicken in baking pan with 1 tablespoon melted butter and 1 tablespoon olive oil.
Bake chicken in 375°F oven for 20 minutes or until no longer pink in center
In skillet saute garlic, prosciutto and cook over mean heat for about 4 minutes, stirring constantly.
Add wine and rosemary; and keep stirring constantly keeping bottom of pan clean.
Add tomatoes and broth and bring to boil.
Reduce heat; simmer 10 minutes
Put chicken on serving dish and pour sauce over top.