Preheat oven to 350 degrees F (175 degrees C). Line a 9x13 inch baking pan with aluminum foil or parchment paper, and spray with vegetable oil spray.

In a large bowl, stir together oats, flour, brown sugar, raisins, wheat flour, salt, cinnamon, and walnuts. In a smaller bowl, thoroughly blend oil, honey, egg, and vanilla; pour into the flour mixture, and mix by hand until the liquid is evenly distributed. Press evenly into the prepared baking pan.

Bake 25 to 30 minutes in the preheated oven, or until the edges are golden. Cool completely in pan before turning out onto a cutting board and cutting into bars.