1. In a mixing bowl, combine 1 cup of flour, 1 tablespoon of oil, and 1/2 teaspoon of salt. Mix well.
2. Gradually pour in 1/3 cup of water and knead to form a dough. Set aside for 10 minutes.
3. In a small bowl, mix 1/2 teaspoon of black seed. Set aside.
4. Grate the boiled potatoes and place them in a mixing bowl.
5. Add 1/2 teaspoon of chilli flakes, 1/2 teaspoon of garlic powder, 1/2 teaspoon of ginger powder, 1/2 teaspoon of cumin powder, 1 teaspoon of finely chopped green chilli, 2 tablespoons of finely chopped coriander leaves, 1/2 teaspoon of salt, and 2 tablespoons of corn flour to the grated potatoes. Mix well.
6. Rub some oil on your hands and take a portion of the dough. Roll it into a thin circle.
7. Place a portion of the potato mixture in the center of the rolled dough.
8. Fold the dough over the potato mixture to form a roll shape. Seal the edges by pressing gently.
9. In a small bowl, mix 2 tablespoons of flour and 2 tablespoons of water to form a paste.
10. Apply the flour paste on the edges of the roll to secure them.
11. Repeat the process to make more potato roll samosas.
12. Heat oil in a deep pan for frying.
13. Once the oil is hot, carefully place the samosas in the pan and fry until they turn golden brown and crispy.
14. Remove the samosas from the oil and drain them on a paper towel to remove excess oil.
15. Serve the hot and crispy Potato Roll Samosas with chutney or sauce of your choice.

Note: Adjust the spice level by adding more or less chilli flakes and green chillies according to your preference. Enjoy the samosas as a delicious snack or appetizer.

Please note that the provided nutrition information is an approximate estimation and may vary based on the specific ingredients and quantities used.