Preheat oven to 355 degrees F (180 degrees C). Grease 24 fairy cake cases (muffin cups) or line with paper liners.
Beat butter and sugar together in a large bowl with an electric mixer until light and fluffy. Add 1/2 of the flour and 1/2 of the eggs; whisk until smooth. Add remaining flour and eggs and whisk until batter is light and fluffy; spoon into prepared muffin cups.
Bake in the preheated oven until golden, 10 to 12 minutes.
Half the ingredients if you want to make just 12 or double if you want to make 48.
If hand-mixing and the batter becomes lumpy, mix again with an electric whisk.
Regularly check on the cakes when they are in the oven.
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