Chocolate-Pecan Fudge

1/2 cup butter or margarine
3/4 cup Hershey's cocoa
4 cups confectioners' sugar
1 teaspoon vanilla extract
1/2 cup evaporated milk
1 cup pecan pieces
Pecan halves (optional)

Line 8-inch square pan with foil. In medium-size microwave-safe bowl place butter. Microwave at HIGH (100%) 1 to 1 1/2 minutes or until melted.

Add cocoa; stir until smooth. Stir in confectioners' sugar and vanilla extract; blend well (mixture will be dry and crumbly). Stir in evaporated milk. Microwave at HIGH 1 minutes; stir. Microwave additional 1 minute or until mixture is hot.

Beat with wooden spoon until smooth; add pecan pieces. Pour into prepared pan. Cool. Cover; chill until firm.