Preheat the oven to 250 degrees F.
Mix the maple syrup, oil and light brown sugar in a large microwave-safe bowl and microwave until the sugar has dissolved.
Combine the dry ingredients with the wet ones and spread the granola over 3 full sheet trays.
Bake the granola in batches, mixing occasionally to insure even baking, until dry and light, 20 to 30 minutes. Carefully mix in the raisins and currants and bake until golden brown, about 20 minutes more. Mix the granola one final time after it is removed from the oven.
This recipe was provided by a chef, restaurant or culinary professional and makes a large quantity. The Food Network Kitchens have not tested it for home use and therefore cannot make any representation as to the results.