Beat the soft butter and both sugars until light and fluffy.
Add your eggs and vanilla. And mix until combined.
Next, add your flour, baking powder, bicarbonate of soda and salt until just combined.
Finally, add you chocolate and sprinkles and stir through until well distributed.
Divide the dough into balls weighing about 170g each. These are BIG! You should get about 7-8 cookies from this mix.
Pop the dough balls in a sealed container and refrigerate overnight. These will last in the fridge for 5 days.
The following morning, preheat your oven to 180°C.
Line two baking sheets with greaseproof paper. Alternatively, you can just use one and bake in two batches.
When the oven is ready, arrange the dough balls on the sheets with plenty of room to spread out. Max 4 per sheet.
Pop the tray(s) in the oven and bake for 10-12 minutes until golden brown. These will still be soft to touch when they come out of the oven, but will firm up as they cool.
Leave them rest for 15 minutes on the baking tray before tryiing to move them.
Enjoy!