Beat together your brown sugar, caster sugar and butter in a bowl until creamy
Add your egg and vanilla into your mixture and beat again
Stir in your flour, baking powder and bicarbonate of soda.
Take one of the bags of Mini Eggs and chop them up/crush them with the side of a large knife. Add them to your bowl along with the milk chocolate. Mix everything together until you get a cookie dough texture (don't be afraid to get your hands in there!)
Roll your dough into 115g balls (your mix should make around 7-8 cookies)
Take your other bag of Mini Eggs and push them whole into the cookie dough balls
Pop your cookies in the freezer for at least half an hour (this will ensure they won't spread too much while they're cooking). Meanwhile, preheat your oven to 180°C
Bake your cookies for 12-14 minutes.
Allow to cool for around 30 minutes before eating. You can always pop them in the microwave for 10 seconds or so afterwards so they're super gooey!
