BEAT eggs and milk large bowl with wire whisk until well blended. Stir in stuffing mix, 1 cup of the cheese, the peas, tuna, soup, onions and pimiento until well blended. Spoon into greased 9-inch microwaveable pie plate. Cover loosely with sheet of wax paper.
MICROWAVE on HIGH 5 minutes. Stir thoroughly to completely mix center and outside edge; smooth top. Cover. Microwave an additional 5 minutes or until center is no longer wet.
SPRINKLE with remaining 1/2 cup cheese; cover. Let stand 5 minutes.