Preheat oven to 375°F. Blend chicken, spinach, feta cheese, mayonnaise, onion and oregano in medium bowl. Unroll dough; separate into 4 rectangles. Press each into 4x5-inch rectangle, firmly pressing perforations to seal. With sharp knife, cut each rectangle into 4 squares. Spoon 2 scant teaspoons of chicken mixture onto center of each square.
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