In a bowl, cream butter and brown sugar. Add egg yolk and vanilla; mix well. Combine flour, baking soda and salt; add to creamed mixture alternately with milk. Press into a greased 15x10x1-in. baking pan. Spread with jelly.
For filling, combine almond paste, butter, sugar, egg white and vanilla in a bowl. Beat in eggs. Add food coloring; mix well. Pour over jelly layer. Bake at 350° for 35 minutes or until set. Cool on a wire rack.
For icing, heat chocolate and butter in a small saucepan on low until melted. Add confectioners' sugar and enough milk to make a smooth icing. Stir in vanilla. Immediately spread over bars. Cover and store overnight at room temperature before cutting.