Preheat oven to 300F. Add all the ingredients, except crystallized ginger and raisins, into a bowl and give it a good mix. Spread the mixture on a baking sheet.
Bake in the oven for 20 mins, stirring it halfway. Once granola is done, pull it out of the oven and let it cool down
Sprinkle cooled down granola with ginger chunks and raisins before giving it a mix. Store in an airtight container.