Steps to cook potato:

Boil potatoes until soft.
Peel the boiled potatoes and semi mash keeping few small chunks. Set aside.
Heat pan and add oil.
Add onion and garlic and sauté until slightly brown.
Add cumin seeds and green chili.
Mix smashed potatoes in the oil mixture.
Add salt.
Cook 3-4 minutes stirring often until everything is mixed.

Steps to assemble shrimp:

Soak satay skewers in water.
In a shallow bowl pour water and set aside.
Beat egg and set aside.
Sprinkle the chili powder and some salt on the shrimp.
Cut along the back of each shrimp to form a butterfly shape.
Fill each shrimp with filling. Press the sides carefully to close.
Push one of the soaked stick through the shrimp and out to the top.
Place a rice paper sheet in the shallow bowl of water until soften and wrap around the shrimp.
Brush wrapper with egg.
Deep fry shrimp in oil until golden and crispy.
Drain oil in paper towel before serving.
Notes :

Drain oil from fried shrimp in paper towel before serving.