Preheat oven to 350°F. Lightly coat a 9-inch round cake pan with baking spray; set aside. Whisk together yogurt, eggs, granulated sugar, oil, orange zest, and vanilla extract in a large bowl ...

Equipment and preparation: For this recipe you will need a 15cm/6in, 23cm/9in and 30cm/12in round cake tin, thin cake boards of respective sizes, and 20cm/8in, 28cm/11in, 35cm/14in thick cake boards.

Add the flour and the baking powder and process for another 5 to 10 seconds, or until smooth. Butter an 8-inch round cake pan (2 inches deep) with the reserved 1/2 teaspoon butter. Pour the cake ...