3 c. chocolate chips
1 can sweetened condensed milk
1 tsp. vanilla

Grease a 9 inch square pan with butter. (For thinner fudge use a 9 x 13 inch pan). In a medium saucepan melt chocolate chips with sweetened condensed milk over medium heat, stirring constantly. When chocolate mixture is smooth, add vanilla and mix well.

Pour mixture into greased pan. Cover pan with plastic wrap or tin foil and refrigerate 2 hours until firm. Cut into squares.