Preheat oven to 350 degrees. Line 2 baking sheets with parchment paper.
If you need to make oat flour, place 1 ¾ cups rolled oats in a food processor and process until powdery. Place oat flour, baking soda, salt cinnamon, ginger, cloves, and nutmeg in a large mixing bowl and whisk together.
Place walnuts in a food processor and blend into a fine meal. Add oil, maple syrup, coconut sugar and pumpkin and process until mixture has the consistency of natural nut butter.
Stir walnut mixture into flour mixture. Fold in 2 cups rolled oats and the raisins.
Use a 1 ¾ -inch ice cream scooper to form dough into balls, and place on baking sheets. You can fit 12 on a sheet. Flatten cookies slightly with a damp hand. Bake 13 to 15 minutes or until cookies begin to brown and tops look dry.
Cool a few minutes and then transfer to wire rack to cool completely.