In mixer bowl beat butter with powdered sugar.
Add in heavy cream until it's smooth and mix in pineapple jam.
Frosting should be smooth and silky.
Place frosting into a piping bag fitted with a large closed star tip (I used a 2D tip) and pipe the frosting onto 1/2 of the cookies and top with the other 1/2 of the cookies.
Chill the cookies filled with frosting for the frosting to set up firm.