How to Make It
Heat oven to 375° F. Heat the oil in a large saucepan over medium heat. Add the onion and cook, stirring occasionally, until soft and golden brown, 10 to 12 minutes. Add the curry powder, ¾ teaspoon salt, and ½ teaspoon pepper and cook, stirring, until fragrant, about 1 minute. Stir in the potatoes and peas.
Unroll the piecrusts and cut each into 6 triangles. Place a heaping tablespoon of the potato mixture in the center of each piece. Gather the corners of the dough and pinch to form a point. Pinch the seams to seal. Transfer to a baking sheet.
Bake the samosas until golden, 22 to 25 minutes. Serve with the mango chutney, if using.