Leftover bread or buns
butter

Spread leftover bread pieces with butter. Place in plastic bag in freezer. When a large amount has been collected, tear bread into pieces, place on a large cookie sheet, and place in a very low oven for several hours to dry out completely. When totally dry, place bread pieces in food processor about 2 cups at a time. Process with steel blade, using on/off turns. Freeze for future use.