Do you have a suggestion, recipe, or tip to make a good pastry cream using Jellllllll

1 1/2 cup heavy whipping cream and 1 package instant vanilla pudding, beaten together until stiff. Then whip in milk by the tablespoon until you get the consistency you want for the use you have in mind. I sometimes will add in a bit more vanilla. You can also use other flavors of instant pudding instead of the plain vanilla, if you wanted. If you use chocolate instant pudding, add in a teaspoon of instant espresso powder to amp things up some. This stuff will pipe nicely if you keep it on the thicker side, and wont' squish out of a cake so easily.