Butter and line a 23 x 32cm swiss roll tin with baking parchment. Beat the eggs and golden caster sugar together with an electric whisk for about 8 mins until thick and creamy. Mix the flour, cocoa powder and baking powder together, then sift onto the egg mixture. Fold in very carefully, then pour into the tin.
Manufacturer likely did not include an allergen statement; however, please double-check the product packaging and/or contact the manufacturer if you have a severe food allergy.