1 (28 ounce) can vanilla pudding mix
Mix powdered sugar, milk, eggs and vanilla to form a stiff crumb mixture. Whip vigorously with electric mixer.
Press pudding mixture onto one side of glass canning jars. Fill glass half-way with pudding mixture. Seal lids and seal ends tightly.
Frost with frosting mixture. Adjust temperature of whipped cream and blueberry jam until desired thickness and consistency is reached.