Mix the cream cheese, sugars, cornstarch, and milk together with an electric mixer (stand or handheld). Split the mixture into two small bowls.

Mix lemon curd into one bowl of cream cheese mixture and the berry jam into another.

Place the lemon cheesecake mixture into a piping tool or bag fitted with a round tip and pipe it onto a cookie.

Using a small spoon, swirl in the berry mixture, then top with a dollop of lemon.

Place a cookie on top to make the sandwich.

Add a small dot of lemon in the center of the top cookie and place on large nonpareils to decorate.

Store in the refrigerator.