1 (6 ounce) package semisweet chocolate chips
1 cup creamy peanut butter
1/2 cup butter or margarine
1 cup sifted confectioners sugar

Cook first 3 ingredients in saucepan over low heat, stirring constantly, just until mixture melts and is smooth.

Remove from heat. Add confectioners' sugar, stirring until smooth. Spoon into a buttered 8-inch square pan; chill until firm.

Let stand about 10 minutes at room temperature before cutting into squares. Store in refrigerator.

Makes 1 1/2 pounds.