Make sure the lemon curd is portioned and frozen - see notes on this in blog post
Add the butter and sugars to a bowl and beat until creamy
Add in the egg and lemon zest and beat again.
Add in the plain flour, cornflour, baking powder, bicarbonate of soda, and salt and beat until a cookie dough is formed
Add in the white chocolate chips and poppyseeds and beat until distributed well
Weigh your cookies out into ten cookie dough balls - they're about 90g each
Once they're rolled into balls, press the dough in the palm of your hand, and add a lump of frozen lemon curd and wrap the cookie dough around it.
Chill the cookies in the freezer for at least 30 minutes, or in the fridge for an hour or so
Whilst the cookie dough is chilling, preheat your oven to 200ºc/180ºc fan
Take the cookies out of the freezer/fridge and put onto a lined baking tray. I put five cookies per tray
Bake the cookies in the oven for 11-13 minutes.
Let the cookies cool on the trays for at least 30 minutes, as they will continue to bake whilst cooling!
Notes
These cookies will last for 4+days at room temperature or in the fridge
These cookies will freeze for 3+ months
If you want to make these smaller, I'd suggest skipping stuffing them as it probably won't work (too messy/exploding cookies). Use a 5cm scoop and bake for 9 minutes for smaller cookies (makes about 15)