Pre-heat oven to 350 degrees. Line a 9 x 13 baking pan with foil and spray with cooking spray.
Mix the dry ingredients in a large bowl. In a small bowl, mix together the wet ingredients. Pour the wet mixture into the dry and mix well.
Press the granola mixture into the prepared baking dish.
Bake for 15-20 minutes for chewy granola bars. The edges should just start to turn brown. For crunchier granola bars, bake until golden brown, about 25-30 minutes.
Cool in the pan for 5 minutes before removing from the pan with the foil. Cut into 18 bars.
Cool completely before handling the bars or they will fall apart.
Store individually wrapped and air-tight for 2-3 weeks at room temperature.