In a 5- to 6-quart pan, mix 1 quart fat-skimmed chicken broth, 1 quart milk, and 2 cups polenta. Stir often over medium-high heat until simmering, 10 to 12 minutes; reduce heat, simmer, and continue to stir until polenta is thickened and smooth and creamy to taste, 15 to 20 minutes. Just before serving, stir in 1/2 cup grated parmesan cheese and salt to taste.
