7: Once the confectioner's custard has cooled to room temperature, remove the plastic film and whisk vigorously to loosen it. Fold in the whipped cream gently with a soft spatula.
8: Your diplomat cream is ready.
Remarks
Just like the basic confectioner's custard, you can vary diplomat cream to suit your own taste: lemon, apple, pistachio, chocolate, etc. In many recipes, the original confectioner's custard can be replaced with diplomat cream, for a better, lighter result. But do be warned: it will not survive being recooked.