1. Preheat oven to 350 degrees F. Spray an 8 in. cake pan with cooking spray.
2. In a mixing bowl, whisk together flour, baking soda, salt and spices.
3. In a separate bowl, stir together remaining ingredients except for walnuts.
4. Add the wet ingredients to the dry and combine thoroughly. Let sit for 5-10 minutes, then fold in walnuts.
5. Pour batter into the prepared pan. Bake 30 minutes or until a toothpick inserted into the cake comes out clean.