Stir soup, sour cream, black pepper, vegetables, 2/3 cup onions and 1/4 cup cheese in 2-qt. casserole. Cover casserole. Bake at 350°F. 40 min. or until vegetables are tender. Stir vegetable mixture. Top with remaining onions and cheese. Bake 5 min. or until cheese is melted.
For Cheddar cheese lovers- Use Cheddar cheese instead of Swiss cheese.
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