HOLIDAY POTATO CASSEROLE

3 lbs. potatoes, peeled and quartered
1/2 cup butter or margarine
2 (3 oz ea) packages cream cheese, softened
1 cup shredded Cheddar cheese, divided
1 jar (2 oz) pimento, drained
1 small green pepper, seeded and finely chopped
1 bunch green onions, finely chopped
1/2 cup grated Parmesan cheese
1/4 cup milk
1 t. salt

Cook potatoes in boiling water to cover 15 minutes or until tender; drain and mash. Add butter and cream cheese; beat at medium speed with an electric mixer until smooth. Stir in 1/2 cup Cheddar cheese and next 6 ingredients; spoon into a lightly greased 11x7x1 1/2 inch baking dish. Cover and chill, if desired. Remove casserole from refrigerator and let stand at room temp. 30 minutes. Bake at 350 degrees F. for 40 minutes or until thoroughly heated. Sprinkle with remaining 1/2 cup Cheddar cheese; bake an additional 5 minutes or until cheese melts. Serves 8.