Cut a horizontal slit in one side of each chicken breast half to within ½-inch of the opposite side. Spread honey mustard inside each pocket; stuff with two ham slices.
Place in a greased 13-by-9-by-2-inch baking dish. Brush with butter; sprinkle with pretzels. Bake, uncovered at 350 degrees for 40–45 minutes or until chicken juices run clear.
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