Preheat your oven to 400°F and line a baking sheet with parchment paper.
Boil the finely diced potato in a small pot of water until just tender, then drain and set aside.
Heat the olive oil in a skillet over medium heat and add the cumin seeds, toasting until they become fragrant.
Add the ground turkey to the skillet, breaking it into small crumbles and cooking until no longer pink.
Stir in the cooked potatoes, frozen peas, turmeric, garam masala, sea salt, and black pepper; cook for 3 minutes to combine flavors.
Cut the large tortilla into four equal triangles to serve as your samosa wrappers.
Place a portion of the turkey filling in the center of each triangle, fold the edges inward to form a pocket, and seal with a touch of water.
Arrange the samosas on the prepared baking sheet and bake for 10 to 12 minutes until the edges are golden and crispy.
While the samosas bake, whisk together the Greek yogurt, chopped cilantro, mint, and lemon juice in a small bowl to create the chutney.
Serve the hot samosas immediately alongside the chilled mint-yogurt chutney for dipping.