Mix corned beef, sauerkraut and dressing. Heat to boiling; reduce heat. Simmer uncovered, stirring occasionally, 3 minutes. Heat oven to 375^, Generously grease 12-cup bundt cake pan. Mix remaining ingredients beat vigorously 30 seconds. Spread 2 cups of the batter in bottom and about 2 inches up side and center of pan. Sprinkle cheese over batter in pan. Spoon reuben mixture evenly onto center of batter. Drop remaining batter by teaspoonfuls about 1/2 inch apart onto corn beef mixture.Spread slightly to connect. Bake until light brown and firm, about 25 minutes. Invert on heatproof serving plate.