Sift together into a large bowl flour, sugars, 1 teaspoon of cinnamon, salt and ginger. Stir in orange zest and oil until mixture is moist. Reserve 3/4 cup of the flour mixture in a small bowl, set aside (save for topping).
Stir baking powder and baking soda into main flour mixture. Beat together buttermilk and egg. Add to cake batter and mix until just combined (do not over mix). Pour batter into a lightly greased 9 x 13-inch baking pan.
Combine reserved flour mixture with walnuts and remaining cinnamon. Sprinkle evenly over cake batter.
Bake 40-45 minutes until center springs back or toothpick comes out clean when inserted in middle. Cool completely before serving.
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