Billy's Mum's Cheesecake

I suggest making 2 because they're sooooooo yummy. Best I've ever tasted.
Base:
1 packet Nice (that's the name) biscuits
90g butter, melted
1 egg, lightly beaten
Filling:
750g cream cheese, softened at room temperature
1 cup sugar
1tsp vanilla essence
3 eggs
if you desire, some topping (eg. frozen berries pureed)

1. Line 23cm spring form tin with foil.
2. Process or crush biscuits. Add melted butter and egg to mixture to combine.
3. Using back of spoon or fingers press crumbs up sides of tin. Press leftovers onto base. Put in fridge while making filling.
4. Process or beat cream cheese, adding sugar and eggs (one at a time). Add vanilla and process until smooth. Pour into tin.
5. Add desired topping. I used some pureed berries, swirled into the top.
6. Bake at 160'C for 40-45min. Cheesecake should be quite wobbly in the middle. Overcooking the cake will make it so-so. Cool and refrigerate before serving.