Preheat oven to 350 degrees.
Combine butter, oil and sugar in the bowl of an electric mixer and beat for 1 minute on medium. Add in eggs and vanilla and mix for another 1-2 minutes, until batter is light and slightly frothy.
In a separate, medium-sized bowl combine vanilla, flour, starch, gum, salt, powder, soda and cinnamon. Toss to combine.
Slowly add in the dry ingredients to the wet ingredients and mix well after each addition.
Add in carrots and nuts. Mix by hand until well incorporated
Spray 3 9-inch round baking dishes with non-stick cooking spray and pour even amounts of batter into each.
Bake in preheated oven for 26-30 minutes, or until sides begin to pull away from the pan.
Let cakes cool completely before frosting.