Chocolate Pudding Cake

My family loves pudding cakes.

This recipe differs from many others in that it includes walnuts - a genius move!

However, our final product had only about 10% cake and 90% pudding. I have compared the recipe to others, and identified two mistakes.

This recipes says to bake for 30 minutes, and to serve immediately. But other recipes (with nearly identical ingredients and volumes) bake for 40 minutes. And similar recipes suggest waiting 15 minutes before serving. Both these things - longer cooking and longer cooling - would increase the amount of cake.