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Preheat oven to 350F.
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In a large bowl, combine all the dry ingredients, making sure that the sugar is broken up and without lumps.
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In a smaller bowl, combine oil, honey, egg, and vanilla extract, blending together.
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Add the wet ingredients to the dry, mixing well with a spoon.
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Pour the mixture into a lightly greased 9x13 pan, and using a flat-bottomed glass or Tupperware container, press firmly into a flat layer in the bottom of the pan.
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Bake for 20-25 minutes, until the edges brown. Allow to cool for 10 minutes before cutting into bar shapes.
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Store in an airtight container. Bars will last for 2-3 weeks at room temperature, sealed.