How to prepare Vanilla Cream for Pastry For the cream, you can use just cornstarch or just flour in the same total amount to thicken it, it depends on what you want to make. With this cream, you can fill pastries, make a Mille-Feuille cake, cream puffs, cannelloni custard and even some cakes. The process of making the cream is classic and very simple, at first it may seem difficult, but if you follow each step you will see how easy it is. Follow recipe. Ingredients: simple,