Mix flour, salt, baking soda, and oil; gradually add water to form a stiff dough. Rest it for 20 minutes.
Boil and mash the potatoes; set aside.
In a pan, heat oil, then sauté cumin, mustard seeds, ginger, garlic, and chopped chili.
Add mashed potatoes, turmeric, red chili, amchur, garam masala, salt, peas, and cilantro. Mix well and cool.
Divide dough into balls, roll each into an oval, cut in half, and shape into cones.
Fill each cone with the potato mixture and seal with water.
Lightly brush samosas with oil.
Air fry at 370°F (188°C) for 15–18 minutes, flipping halfway through until golden and crisp.