Boiled and mashed potato in a bowl.add salt,pepper powder,green chilli paste to taste.mix it well.now add corn flour for binding.make a nice dough.grease butter in pie dish.
Now spread potato doughevenly in it..make hole in it with the help of tooth pick.bake it in other for 20 mints @,200 c
Till becomes light.take it out and cool completely

Now heat oil /butter in a pan.saute chopped spinach till it becomes dry on medium flame of the gas.add boiled corn in it.mix it well.switch off gas.
Let it cool
Add salt,pepper powder,oregano chilli flakes,cheese /cottage cheese according to your taste.
Now spread it on baked potato pie

Sprinkle oregano,chilli flakes on it.grated cheese on it.
Again bake it at 200 c for 15 to 20 minutes till cheese melt upper coil on.
Once it done take out.
Serve it with tomato ketchup or green chutney.
Note :jain people use boiled banana and cottage cheese
Even you can use bread without slices as a pie base.
Use water and buttermilk to dip bread slices and arrange in pie dish