Put half of the dough into the mold. Sprinkle with 1/3 cup of finely chopped semisweet chocolate. Add the remaining dough and sprinkle with another 1/3 cup of finely chopped chocolate.
Put half of the dough into the mold. Sprinkle with 1/3 cup of finely chopped semisweet chocolate. Add the remaining dough and sprinkle with another 1/3 cup of finely chopped chocolate.