Cheesecake (baked)

Base

• 120 g butter, unsalted, cut in pieces, plus extra for greasing
• 250 g plain biscuits
  of 250 g digestive biscuits
• 30 g brown sugar

Filling

• 750 g cream cheese
• 120 g cream, min. 30% fat
• 220 g caster sugar
• 1 ½ tsp vanilla sugar, homemade
  of 1 ½ tsp natural vanilla extract
• 3 medium eggs
• 1 egg yolk, from medium egg