Line a 28x28cm square sheet pan with aluminum foil I find that aluminum foil is easiest to peel off this type of cake. Use two sheets overlapping to form a cross and leave enough extra overhang on each side so that you can fold the foil over the edges of the sheet. This way, foil won’t fold over forwards into the batter which gives you uneven edges. Preheat the oven to 180° Celsius 360° Fahrenheit using the conventional setting no fan. Place your oven rack at the lowest possible level.

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