Preheat your oven to 350°F/180°C
Line two 8 inch/20cm round cake pans with parchment on the bottom and grease sides, set aside. For a single layer cake 1 large 10”/25cm round cake pan.
In a large mixing bowl whisk together the olive oil, sugar, eggs, and vanilla, until smooth.
Add the grated carrot, parsnip, and spices, and mix well. Then add sour cream and vinegar, mix well.
Next, fold in the flour, baking powder, baking soda, and walnuts.
Now pour the cake batter evenly into the two 8”/20cm round cake pans, about 24oz/680g each pan without walnut or 25oz/728g with walnuts. Or, divide among four 6” pans with 340g of cake batter each pan.
Bake at 350°F /180°C for 45 minutes for 8” pans. Bake 25 minutes for 6” pans, makes four small cakes.
Remove from the oven and allow to cool completely.