Brown meat and onion, drain. Stir in spaghetti sauce. Combine cheese and sour cream. Pour meat and sauce into ungreased 9x13. Spoon cheese mixture over meat. Separate crescent rolls into 2 rectangles. Place rectangles over cheese mixture. Melt oleo and drizzle over crescent rolls. Sprinkle with parmesan cheese. Bake uncovered at 375 for 25 min or until golden brown. Freezes well; thaw before baking.
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