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In a large bowl, mix together flour, both sugars, baking powder, baking soda, and salt.
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Place into a sealable bag and store for up to 2 months.
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To make a cake: Preheat oven to 350F (180oC). Grease and line a 2x 9-inch cake tins or 3 6-inch cake tins.
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Into the dry cake mix, whisk in the eggs, oil and buttermilk until combined. Add in vanilla extract if desired.
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Stir the wet ingredients into the dry ingredients and mix to form a smooth batter.
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Pour batter into prepared cake tins. Bake for 35-40 minute or until a toothpick inserted in the center comes out clean. Allow to cool.
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Store for up to 2 months or freeze for up to 4 months.