Mix flour and salt; cut margarine in until mixture begins to form a ball. Blend in sour cream. Divide dough into 4 parts. Wrap each part and chill several hours.
Heat oven to 350 degrees. On floured board, roll each section into a 12 x 6-inch rectangle. Sprinkle one-half each rectangle with either cheese, onion, mushrooms or olives.
Fold dough over to make a 6-inch square. Cut the 6-inch square into 2-inch squares, pressing edges.
Continue until all dough is prepared. Bake on un-greased cookie sheet at 350 degrees for 20 to 25 minutes. May be prepared in advance and refrigerated, then baked for 30 minutes.
Makes 36 appetizers.
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