Earthy, crunchy and positively delicious, granola is a breakfast cereal most commonly made from rolled oats, nuts, honey, and sometimes dried fruit and other grains. While originally sold as a health food, it can be high in fat and sugar. Making it at home is the best way to control the ingredients and enjoy the freshest tasting granola. Granola was invented in the late 1800s but became most popular in the US in the 1970s.