In a microwave, melt 1/2 cup chocolate chips and shortening; stir until smooth. Dip rims of four parfait glasses in chocolate; sprinkle with jimmies. Let stand until set.
In a small saucepan, combine the cream, egg yolks, vanilla, coffee granules and remaining chocolate chips. Cook and stir over medium heat until mixture reaches 160° or is thick enough to coat the back of a metal spoon. Cool, stirring several times.
In a small bowl, dissolve coffee granules in 1 tablespoon whipping cream. Add remaining cream; beat cream mixture until it begins to thicken. Add confectioners' sugar; beat until soft peaks form. Fold 1-1/2 cups of cream mixture into cooled chocolate mixture.
Spoon about 1/4 cup chocolate mousse into each parfait glass; spoon or pipe about 1/4 cup cream mixture over mousse. Repeat layers. Refrigerate for at least 2 hours.