Mix confectioners sugar and cocoa in a greased 8x8 inch glass baking dish. Add evaporated milk and butter; do not mix, Microwave on High for 2 minutes or until butter is melted. Stir until mixed. Add vanilla and pecans; mix well. Spread evenly in dish. Chill for 1 hour. Cut into squares.
Cajun Country -- New Iberia, Louisiana