In a small saucepan, bring broth and wine to a boil. Reduce heat; simmer, uncovered, for 12-15 minutes or until reduced to about 3/4 cup. Stir in the capers, shallot, sage, parsley, garlic, thyme and pepper flakes. Return to a boil. Reduce heat; simmer 4-5 minutes longer. Stir in butter until melted.
Place asparagus in a 3-qt. baking dish coated with cooking spray. Pour sauce over asparagus; top with prosciutto. Bake, uncovered, at 400° for 12-15 minutes or until tender. Sprinkle with cheese before serving.