Baking Butter Nutella Cake

Saw this yummy receipe for a Butter Nutella Cake.. So i was thinking of baking it for my kids to eat. But as it turn out, it wasn't so nice... I still prefer my old recipe for the butter cake. Mayb it might be some steps which I did not do correctly. My hubby told me it taste like '发糕', whereas my boys only like the top layer of chocolate coating and the M&M chocolates.