Grease and line a 22 cm square cake tin or container with baking paper, leaving a 2-inch overhang on the sides.
Place rice crispies in a large bowl. Add 200 g melted dark cooking chocolate. Mix to coat the rice crispies in chocolate. Smooth top. Refrigerate for 15 minutes.
Meanwhile, place 200 g dark chocolate and condensed milk in a microwave safe bowl. Microwave for 1 minute.
Working quickly, stir in vanilla extract.
Pour onto rice crispies base. Spread evenly using a spatula. Smooth top.
Press chocolate egg halves onto the fudge.
Refrigerate for about 2-3 hours or until firm.
Decorate with your favorite Easter toppings.
Remove from baking pan and cut into squares or rectangles.