Preheat oven to 340°F/170°C and generously butter and flour a 9-inch or 10-inch springform bundt pan.
In a large bowl whisk the eggs and sugar with a hand mixer until pale and fluffy, about 2 minutes.
Continue to whisk and slowly pour in the extra-virgin olive oil, followed by the milk, then whisk in the vanilla extract and orange zest.
Place a sieve over the bowl, add the flour and baking powder and sift the ingredients into the bowl. Whisk all the ingredients gently until just combined, do not over mix.
Pour the cake batter into the prepared bundt pan. Place in the oven and bake for about 40 minutes, or until a toothpick inserted in the center comes out clean.
Remove the ciambellone from the oven and allow to cool completely at room temperature, then remove from the cake pan. Sprinkle some confectioner's sugar on top if you like and serve.
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Notes
Please note that all my baking recipes are tested with grams measurements, which are more accurate than cup measurements. US cup amounts are provided, but for best results please always use a scale when measuring ingredients.STORAGE TIPSServe: You can leave your olive oil bundt cake at room temperature for up to 2 hours, or longer when placed under a cake cover in a cool dry spot in your kitchen.Fridge: Cut the cake into slices and transfer them to a ziplock bag or another airtight container to store in the fridge. They will keep well in the refrigerator for 3-4 days.