Thaw puff pastry according to package directions. Cut into sixteen 2-1/2-inch squares. Place each square in a 2-1/2-inch muffin cup. Place about 1 teaspoon of the tapenade on each square. Top with two cherry tomato quarters and some of the feta cheese.
Bake in a 425 degree F oven for 12 to 15 minutes or until pastry is puffed and golden brown. Remove from muffin cups. Garnish with fresh herb sprigs, if desired. Serve warm. Makes 16 appetizer servings.