Butter: I use unsalted butter for this recipe, melting it quickly in a microwave-safe mug. For those in the US, this amount is about three-quarters of a stick of butter.
Cream cheese: I prefer Philadelphia brand cream cheese for the best results. While other brands can work, they tend to be slightly harder to blend smoothly. Make sure to use full-fat cream cheese and drain off any excess liquid before using.
Cream: Use cold cream straight from the fridge and whip it until it holds firm peaks, achieving a texture similar to ice cream. In the US, heavy cream serves as an equivalent to double cream.