Saute onion and pepper in butter until tender. Grease shallow 3-quart baking dish; add hash browns. Sprinkle in Swiss cheese and half the bacon, the top with onions/peppers. Beat cream cheese at medium speed until creamy; add eggs and milk, beat until smooth. Add parmesan, salt and pepper, and mix until just blended.nPour over casserole and top with remaining bacon. Cover tightly and chilln8-12 hours.