Place all of the ingredients, apart from the mini eggs, in a large bowl and beat together with a hand mixer or wooden spoon.
Stir in the chopped mini eggs, keeping a handful back.
Shape into 12 balls, flatten them ever so slightly and push a few bits of reserved mini eggs into the top.
Place them on a plate and pop in the fridge for at least 1 hour.
Heat the oven to 180℃/200℃/400F or Gas Mark 6.
Place the chilled cookies onto parchment lined baking sheets with plenty of space between them. (Use 2 baking sheets or bake in 2 batches of 6.)
Bake for 15-18 minutes or until the cookies are golden on the edges.
Allow to cool a little before moving the cookies to a cooling rack.
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