Using the straw punch a hole in the top edge of the bread. Lay the bread out on a cookie sheet and allow to air dry 2-3 days. Mix the popcorn and the sunflower seeds and put in shallow dish ( or wax paper for easy clean up). Thread the string or ribbon through the dried bread. Spread the peanut butter on both sides of the bread. Press each side into the popcorn mixture. Hang/tie the bird feeders to a tree or fence post.