How to bake a cake

[Astreja]

I always wanted to make muffins one day to be honest.

That just has to be a euphemism.

And if it isn't, it needs to be.  

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I would use melted butter instead of olive oil. Makes it taste better.

I would avoid using olive oil in cake or other sweet things because it has such a strong and distinctive flavour.  If I have a cake or muffin recipe that calls for oil I usually go with sunflower or safflower oil.