"So this recipe calls for ground pretzels. You can either use a food processor or blender to grind them up or smash them to smithereens in a ziploc bag. Take care not to grind them so small like the consistency of flour. It should be like a very coarse meal with small pretzel pieces - kind of like a crunchy dry cornmeal mixture. Too fine and the muffins will be dry. You'll also need some broken pretzels for the streusel - I left mine pretty chunky, just a pound or two with a rolling pin so they stay in nice big chunks. FYI: I used pretzel sticks but any thin pretzel like that (twists or sticks) should work fine...."