You will need two ramekins that are 3.5 inches wide and 2 inches high (see notes). Cut out strips of non stick baking paper and arrange them across each other (see photo above), using a dot of butter to help them stick to the base of the ramekin if needed. The paper strips are only necessary if you want to take the cheesecakes out of the ramekins to serve. You can use larger ramekins too for slightly smaller cheesecakes.
Now make the crust. Blitz the biscuits in a food processor or blender/grinder till finely crumbed. (I didn't use a food processor since the quantity is so small). You need about 1/3 cup crumbs so you might need more or less biscuits depending on what you're using.
Tip the crumbs into a mixing bowl and stir in the melted butter until the mixture clumps together.
Divide this mixture equally among the two ramekins, pressing it down firmly into the base. Chill the ramekins for 20 minutes.
Preheat the oven to 160 C.
In the meantime, make the filling. Wipe out the mixing bowl, then add in the cream cheese and yoghurt. Use a hand mixer and beat the two together on medium speed until smooth. Add the Nutella, sugar, egg and vanilla and beat again till combined. Avoid over-beating.
Pour the mixture equally over the chilled biscuit base in both ramekins. They will be full almost all the way but won't overflow.
Bake for 25 to 30 minutes until the cheesecakes look set on the edges (small cracks may appear, this is ok) and are slightly wobbly in the center. Let them cool and set further at room temperature for 30 minutes, then place in the fridge at least 6 hours or overnight.
To remove the cheesecakes, run a sharp knife around the edges, then use the paper strips to gently wiggle them out of the ramekins. They should come out cleanly.
Top with whipped cream and strawberries! Store the cheesecakes in the fridge for 4 to 5 days and in the freezer for longer. Happy baking!