Place mushroom mix at long end of phyllo, about 2 inches from each end and from one edge. Carefully roll phyllo to form a long roll. Fold in ends and brush entire log with butter. Repeat until all of the mix and phyllo are used. Preheat oven to 350 degrees.
Place rolls on parchment covered sheet pan.
Cook rolls 18-22 minutes, until golden brown. Slice and serve.