Insanely Simple Fudge

Melt chocolate chips in microwave proof bowl for one minute. Stir. Repeat one minute intervals of heating then stirring until chocolate is smooth and creamy. Stir in the 14 ounces (1 can) sweetened condensed milk into the creamy chocolate, blending completely by hand. Sift in 1/3-1/2 cup powered sugar into chocolate mixture. Blendly completely. Stir in 1/3-1/2 cup chopped walnuts, if desired. Pour mixture into buttered 7 1/2x9 1/2 pan. (Corelle oval dish works nicely.) Let set for 6 hours. Cut into bite size squares and enjoy!