Stir in remaining 1 cup broth. Cook 5 to 7 minutes, stirring frequently, until rice is just tender. Stir in caramelized onions, Parmesan cheese, 1/4 cup of the cooked bacon and remaining 2 tablespoons butter. Stir vigorously until rice is creamy. Serve immediately, garnished with remaining 1/4 cup bacon. Serve with more Parmesan cheese, if desired.