4 oz. Baker's Unsweetened Chocolate, chopped
2. LINE 13x9-inch pan with foil, with ends of foil extending over sides. Spray with cooking spray. Microwave chocolate and butter in large microwaveable bowl on HIGH 2 min. or until butter is melted; stir until chocolate is completely melted. Stir in sugar, flour, nuts, eggs and vanilla.
3. POUR into prepared pan.
5. DECORATE with remaining ingredients to resemble Easter eggs.