Take off excess water from yogurt by straining for 2-3 hours.
Make fine paste of strawberries by adding condensed milk.
Beat yogurt,strawberry mixture and cream in a hand blender.
Beat it until smooth and creamy.(for five minutes)
Pour in desirable container and deep freeze.
Freeze it for six hour or more to make a nice solid one.
Scoop out and add choc chips and walnuts and serve.
Notes
If you want you can use ice cream machine to get more texture.
But by doing it with a hand mixer itself you will get good results.
I have beaten it once ,but if you want you can beat in the middle of the freezing hours.