Easter Chocolate Cake

Ingredients
-200g dark chocolate, chopped -200g butter, softened -1 cup brown sugar -1 teaspoon vanilla essence -2 eggs, at room temperature -1 3/4 cups self-raising flour -1/4 cup cocoa powder -3/4 cup milk -1 cup Nutella or other choc hazelnut spread -80 small solid chocolate Easter eggs
Instructions
Preheat oven to 160°C. Grease and line a 20cm (base) round cake pan. Place chocolate into a heatproof, microwave-safe bowl. Heat on MEDIUM for 2 minutes (or longer depending on your microwave), stirring every minute with a metal spoon, or until smooth. Set aside to cool slightly. Using an electric mixer, beat butter, sugar and vanilla essence until creamy. Add eggs, 1 at a time, beating after each addition. Add cooled chocolate. Mix well. Sift flour and cocoa powder together. Fold half the flour mixture into chocolate mixture. Fold half the milk into chocolate mixture. Repeat with remaining flour mixture and milk. Spoon cake batter into cake pan. Smooth surface. Bake for 1 hour to 1 hour 15 minutes, or until a skewer inserted into the centre comes out clean. Stand for 15 minutes before turning onto a wire rack to cool completely. Spread choc-hazelnut spread over cake. Top with Easter eggs. Serve.