Preheat oven to 375 degrees. Unfold 1 puff pastry sheet onto a 10- by 15-inch cookie sheet. In a large bowl, mix together cheeses, onion, eggs, salt and pepper or other flavorings. Spread cheese-onion mixture on unfolded pastry sheet. Unfold remaining puff pastry sheet; place over mixture. Bake for 40 to 45 minutes or until golden. Let cool slightly, cut into squares, and serve warm. Yields about 35 puffs. Recipe Source: St. Louis Post-Dispatch - 10-19-1998 Formatted for MasterCook by Susan Wolfe - vwmv81a@prodigy.com