Preheat an oven to 220°c/200°c fan (428°f/392°f).
Take a large piece of baking parchment, scrunch up then press into an 8" springform tin. Make sure to leave some parchment overhanging the edge of the tin. Place the tin onto a baking tray then set aside.
Add the cream cheese, creme fraiche, caster sugar, vanilla & salt into the bowl of a stand mixer then mix on a low speed with the paddle attachment, for 2-3 minutes, until smooth.Make sure to scrape the sides of the bowl down regularly with a spatula whilst making the batter. It's important to mix on a low speed, so that we don't incorporate too much air into the batter as this will affect the texture of the baked cheesecake. With the mixer still running on a low speed, mix in the eggs one at a time, followed by the yolks.
Next, add the cornflour into a separate mixing bowl then gradually pour in the double cream, whilst whisking, to make a smooth paste. Don't over whisk the cream! Make sure to stop whisking as soon as a smooth paste has formed. With the mixer still running on a speed, gradually mix in the cream & cornflour, followed by the baileys. Give the sides of the bowl a final scrape down then mix again briefly, to make sure that the batter is nice & smooth.
Next, pour the batter into the tin, through a sieve then tap the tin on your work surface a couple of times to pop any air bubbles.
Bake the cheesecake in the preheated oven for 35-40 minutes, until it is a deep brown colour on top & is still jiggly in the centre. If you take the internal temperature of the cheesecake, it should be between 60°c-65°c (140°f-149°f)The cheesecake will have risen once cooked but will fall as it cools. This is normal! For a softer set cheesecake, cook to 60°c/140°f. For a more evenly set cheesecake, cook closer to 65°c/149°f. Let the cheesecake cool to room temperature (this will take a couple of hours) then refrigerate overnight (at least 12 hours).
To serve, take the cheesecake out of the fridge & leave to sit at room temperature for an hour. Take the cheesecake out of the tin then cut the into portions. For the neatest portions, cut the cheesecake using a knife that has been run under warm water & dried between cuts. A non serrated knife works best!