Preheat oven to 350°F. Coat a 9 x 5-inch nonstick pan (or two 5 x 2 1/2-inch pans) with cooking spray, set aside.
Cream the oil, sugar, eggs and vanilla together.
Mix together the flours, starch, xantham gum, sea salt, baking powder and spices. Add flour mixture to egg mixture, alternating with bananas. Stir in nuts and raisins. Batter will be somewhat soft.
Bake the 9 x 5-inch pan for 1 hour, bake the 5 x 2 1/2-inch pans for 45 minutes. Cool on wire rack before cutting.