Heat the oven to 350º F. Coat a 9- by 13-inch pan with nonstick cooking spray and set aside.
Melt the butter or margarine in a large pot over low heat. Remove the pot from the heat and whisk in the sugar, honey, flour, vanilla extract, and cinnamon. Add the remaining ingredients and mix well.
Transfer the mixture to the baking pan. Using a sheet or waxed paper and the palms of your hands, press the granola firmly into the pan, packing it to a flat and even thickness.
Bake for 20 minutes, until golden brown. Allow the granola to cool 1 hour in the pan, then transfer to a wire rack to cool completely before cutting into bars. Makes 16 to 24 rectangular bars.
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