In heavy-gauge saucepan, combine white chocolate chips, heavy cream, and butter. Cook over low heat, stirring constantly, until smooth.
Stir in seedless raspberry jam and raspberry extract, if using. Cover with plastic wrap and freeze for 20 minutes.
Line a baking sheet with foil. Using the 100-sized scooper, drop scoops of the mixture onto the foil-lined baking sheet. You could also drop teaspoonsful of the mixture onto the baking sheet, then shape into balls. Freeze until firm.
While truffles are freezing, heat water in a saucepan. Place a mixing bowl over the hot (not boiling) water. Melt the white chocolate chips and shortening, stirring until smooth.
Drop frozen truffles, one at a time, into the melted coating. Stir quickly to coat. Remove with a fork, shaking off excess coating.
Place coated truffles on the cookie sheet. Decorate with an optional topping like shaved chocolate, finely chopped nuts, a contrasting color of chocolate drizzle, or raspberry dust, if desired.
Chill coated chocolate truffles in the refrigerator until set. Store the white chocolate raspberry truffles in the refrigerator.