Preheat oven to 350°F. Coat a 9” x 5” nonstick pan (or two 5” x 2-1/2” pans) with cooking spray; set aside.
Cream the oil, sugar, eggs, and vanilla together.
Mix together the flour, xanthan gum, 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” pan for 1 hour, bake the 5” x 2-1/2” pans for 45 minutes.