In a medium bowl combine the cream cheese, chicken, sesame seeds, parsley and onion. Season with salt and pepper and mix well.
Open package of crescent rolls. DO NOT divide them into triangles as you usually would! Keep every 2 triangles together, forming 4 squares. Pinch the 'seam' in the middle of each square closed and pat each one out into a larger square. Put a spoonful of the chicken mixture in the center of each square. Fold the corners up into the center, layering like flower petals so that the roll is kind of sealed. Repeat with all 4 squares.
Place popovers on a lightly greased cookie sheet and bake in the preheated oven until golden brown.