Instructions: Cream butter; add sugar gradually. Beat in egg yolk and vanilla. Blend in sifted dry ingredients and milk. Divide dough in half. Mix chocolate into half. Chill. Roll white dough 1/8" thick on floured surface. Roll chocolate the same way and place on top of white dough. Roll as for jelly roll; wrap in wax paper. Chill overnight. Cut in 1/8" slices; place on greased cookie sheets. Bake at 375 for 8 minutes.

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