Sprinkle yeast over water in large bowl. Let stand a few minutes, then stir and dissolve yeast. Add sugar, salt, margarine, 1/2 cup Parmesan cheese, oregano and 3 cups of the flour. Beat at slow speed for 2 minutes. Beat in rest of flour; cover the bowl with a sheet of wax paper and a kitchen towel. Let rise in a warm place 45 minutes, or until doubled in volume.
Preheat oven to 350 degrees F (175 degrees C). Lightly grease one round, 2-quart casserole. Set aside.
Stir batter down for 1/2 a minute. Turn batter into casserole. Sprinkle with the remaining 1 tablespoon Parmesan cheese.
Bake at 350 degrees F (175 degrees C) for 55 minutes.