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Spray a 2-quart casserole with non-stick vegetable spray. Place asparagus in a vegetable steamer over boiling water; cover and steam until tender. Arrange asparagus in prepared casserole. Preheat oven to 350°F. In a small saucepan, sauté onion in butter; add flour, stirring until smooth. Cook for 1 minute, stirring constantly. Add sour cream, salt, and pepper; cook until thoroughly heated, do not boil. Spoon over asparagus. Bake for 15 minutes. Sprinkle top evenly with cheese; bake for 5 minutes or until cheese melts.
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