Homemade granola is a sweet and hearty snack that adds fiber to your diet. Making granola takes a lot of time. Granola can take four to five hours in the slow cooker, or a few hours in the oven, according to Beth Hensperger and Julie Kaufman, authors of "Not Your Mother's Slow Cooker Cookbook." All that effort can be wasted if your granola does not form clumps, however.
