It is true that you should follow the recipe precisely, but it is not forbidden to experiment for better results. If you know what you are doing, of course.

[And that's how Ignis gets himself stuck in an endless loop of 'does this tart taste better or this one'?]

Excellent. It is a three-story cake, [Ignis starts gathering decorations for the cake,] I am sure there will be enough cake for everyone.