Preheat the oven to 400 degrees F.
To a medium bowl, add the garbanzos, maple syrup, cinnamon, and salt. Gently stir until the beans are evenly coated.
Place the garbanzos on a well-oiled or parchment-lined baking sheet with sides. I move all the beans together on the baking sheet so that they sit in the excess syrup.
Roast at 400 degrees F for 15 minutes. Reduce the oven temperature to 350 degrees. Stir the beans and roast in 10-minute increments, stirring after every 10 minutes, until crunchy, approximately 25-30 minutes more. It is helpful to spread them out at this point. Depending on the oven, you may need to bake another 10 minutes or so. Reducing the oven temperature will make it easier to throughly crisp the beans without burning them. (See notes below for a few helpful hints.)