3. Spread the mixture in a thin, even layer on a baking sheet and place on the center rack of the heated oven. Bake, stirring after 15 minutes, until the granola is a very light golden brown. It should take 20 to 30 minutes. If you like your granola crunchier with a toastier flavor, bake it a little longer, keeping a close eye on it—if it gets dark it will taste burnt.