Preheat the oven to 300ºF. In a large bowl, combine all ingredients. Stir to combine evenly. Spread the granola in an even layer on a parchment-lined baking sheet.

Bake for 50 to 60 minutes. About halfway through the baking time, use a large spatula to turn over the granola, breaking the pieces up as little as possible. Rotate the pan to ensure the granola bakes evenly. When it is browned and feels dry to the touch, remove from the oven. Sprinkle with chocolate chips if using and let the granola cool completely.

Store at room temperature in an airtight container.