In the top of a double boiler over boiling water, melt
chocolate chips. Combine milk, egg yolks and sugar;
gradually add to chocolate, stirring constantly. Cook for
2-3 min. Remove from the heat; cool to room temperature.
Fold in cream. Tear cake into bite-size pieces; place half
in a greased 13x9x2" baking pan. Top with half of the
chocolate mixture. Repeat layers. Cover and refrigerate
overnight. Serve chilled.