If you are finding that your granola bars are not sticking together it could be one of two reasons. The first reason would be that you did not let your caramel mixture cook long enough. The mixture should be thick and stick to the back of your spoon without sliding off quickly. The other reason could be that you did not refrigerate your bars before cutting into them. I have found that one hour in the refrigerator is the perfect amount of time to let them set but still be able to cut through them.