You can skip the step of grinding the oats and/or flax completely, but you will probably get fewer clumps. I've found I get more large clumps if I incorporate some sort of ground meal (the oats and/or flax) into the mix. Also, this granola is pretty hard and crunchy. If you want to trade some of the hardness for crispness, incorporate a bit of oil. Two tablespoons of oil makes the granola lighter and less hard.