LINE 8-inch square pan with foil, with ends of foil extending over sides. Microwave 4 oz. chocolate, 6 Tbsp. butter and water in large microwaveable bowl on HIGH 2 min. or until butter is melted;
stir until chocolate is completely melted and mixture is well blended. Add peppermint extrant and dry pudding mix; stir 2 min.
ADD sugar, 1 cup at a time, stirring after each addition until well blended.
Pour into prepared pan; press into even layer with back of spatula.
MICROWAVE remaining butter and chocolate in large microwaveable bowl 1-1/2 min. or until butter is melted; stir until chocolate is completely melted and mixture is well blended. Pour over fudge layer in pan; spread to completely cover bottom layer. Top with remaining ingredients.
REFRIGERATE 2 hours or until firm. Use foil handles to remove fudge from pan before cutting to serve.