Banoffee "Cheese" Cake

1. For the base: Blitz the cookies in a food processor or put in a resealable plastic bag and bash with a rolling pin to a small crumb consistency, then mix in the oil.
2. Press the cookie mixture into the base of a parchment-lined 8-inch springform nonstick cake pan. Press down to form an even base.
3. For the filling: Mix together the sugar, vanilla, cream cheese and lemon juice in a medium mixing bowl. Beat together well and spoon on top of the biscuit base, smoothing out evenly with a spatula or metal tablespoon.
4. Cover and put in the fridge to chill and firm, at least 4 hours and up to 2 days.
5. For the topping: Just before serving, put the chocolate in a heatproof bowl over a pan of gently simmering water (make sure the base of the bowl doesn't touch the water) and stir with a wooden spoon while you let it melt, about 4 minutes. Stir again to make sure it has totally melted, then remove the bowl and set aside. Alternatively, you can melt the chocolate in a microwavable bowl in 30 second bursts, stirring between each burst.
6. When ready to serve, unlock the ring on the pan, lift the cheesecake and put on a serving plate. 
7. Peel and thinly slice the bananas and heap on top of the cheesecake, then drizzle over the Carefree Caramel in a zigzag or spiral pattern across the top, followed by a drizzle of the melted chocolate. Serve. 

Carefree Caramel:

1. Spoon the cornstarch into a jug or bowl and stir in the milk until smooth and free of any lumps.
2. Tip the sugar into a small pan over medium-low heat and allow it to warm, about 2 minutes. Slowly pour the milk mixture into the sugar, stirring constantly with a wooden spoon to keep it smooth. Allow it to heat and gently bubble, stirring until nicely caramelized and thickened to a consistency that is glossy and coats the back of the wooden spoon, about 4 minutes. Refrigerate any extra caramel in an airtight container for up to 2 weeks.