Smash the mini eggs using a rolling pin until they are medium-large chunks
In a bowl, mix the dry ingredients, chocolate chips and mini eggs, and then set aside
In a second bowl, beat together the butter and sugar until it becomes thick and creamed together
Add the eggs and vanilla extract to the butter and sugar and mix until combined
Little by little, add in the dry ingredients to the bowl containing the butter, sugar and eggs and gently mix together
Cover the top of the bowl with cling film and pop into the fridge for at least 4 hours (I recommend 6 hours-overnight for optimum results)
Remove the dough from the fridge and pre-heat the oven to 180°C fan or 200°C conventional
Line a baking tray with greaseproof paper
Using a large scoop, take equal amounts of cookie dough and pop onto the baking tray (spacing at least 2 inches apart) - I recommend only baking 4 cookies at a time in case they spread as they are very large
Add extra chocolate chips/mini eggs to the top of the dough balls if desired
Bake for 14-16 minutes (until they start to brown/turn golden)
Remove from the oven and leave to cool on the baking tray for at least 30 minutes
Once cooled, move to a wire rack to cool completely on the bottom
Enjoy!