Heat oven to 350°. Coat baking sheets with nonstick cooking spray. In a medium bowl, whisk together oats, both flours, baking soda, and salt. In a large bowl, using an electric mixer, blend together peanut butter and oil. Add both sugars, egg whites, and vanilla, blending after each addition. Add oat mixture, chocolate chips, raisins, and walnuts, then blend. Don't worry if mixture appears a tad dry; keep mixing until it comes together. Scoop out 1 tablespoon of dough and, with damp hands, roll it into a ball. Place dough on a prepared baking sheet and press to flatten slightly. Continue with remaining dough, spacing cookies 2 inches apart. Bake 12 to 14 minutes. Allow cookies to cool 1 minute before transferring to a wire rack to cool completely.