In order to make chunky clumps or granola, you will need to crowd the pan a bit. Press the granola into an even layer (I like to use the back of a spatula to do this.) Don't overcrowd it or it will not bake all the way through. If it is really crowded, give the granola a stir about halfway through and press down with the spatula again. When you remove it from the oven, give it one last press down before it begins to cool.