Heat oven to 375 .in 10 skillet,cook beef,onions and celery over med.heat 8 to 10 min. stir frequently, until cooked. drain. stir in sloppy joe sauce,soup and corn. spoon mixture into ungreased 11x7 (2 qt.) glass baking dish. place nuggets in single layer on top. bake uncovered 40 to 50 min. or until bubbly around edges and potatoes are golden brown.