Preheat your oven to 170 degrees.
Beat the egg till pale.
Melt the nutella in microwave till it becomes easy to handle, around 30 seconds.
Add the flour and the melted nutella and incorporate well till done.
Add in the walnuts and choco chips and mix.
Grease your mini bundt pan well.
Pour into each portion, filling upto 3/4 of each mini bundt.
Bake for 15 to 18 minutes till the tester comes out clean.