Nutella Cheesecake (No Bake)

Bahan-bahan (12 porsi)

• 200 g / 7oz Oreo cookies ((1.5 standard packs, Note 1))
• 60 g / 4 tbsp unsalted butter (, melted)
• 3 tsp gelatine powder ((Note 2))
• 1/4 cup water
• 500 g / 1 lb cream cheese (, softened (block form, Note 3))
• 1/2 cup soft icing sugar / powdered sugar ((Note 4))
• 1 cup Nutella ((Note 5))
• 1 cup heavy/thickened cream
• 1/2 cup heavy/thickened cream
• 1/2 cup Nutella
• 1/4 cup dark chocolate chips/semi-sweet chocolate chips
• 1/4 cup hazelnuts (, lightly toasted then chopped (Note 6))
• 1/2 cup heavy/thickened cream ((for whipping))
• 3 tbsp Nutella (, warmed)