Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
In a non-stick skillet over medium heat, add the olive oil and toast the cumin seeds until they become fragrant.
Add the minced garlic and grated ginger to the skillet, sautéing for 1 minute before adding the ground turkey.
Cook the turkey until browned and fully cooked through, breaking it into small crumbles with a spatula.
Stir in the diced boiled potatoes, green peas, turmeric, garam masala, sea salt, and black pepper, cooking for 3 minutes to combine flavors.
Cut each whole wheat tortilla in half; fold each half into a cone shape, securing the edge with a little water.
Stuff each cone with the turkey and potato mixture, then press the top edges together with a fork to seal the samosa.
Place the samosas on the prepared baking sheet and bake for 12-15 minutes until the edges are golden and crisp.
While baking, whisk together the Greek yogurt, finely chopped cilantro, and lemon juice in a small bowl to create the chutney.
Serve the hot samosas immediately with the chilled herb-yogurt chutney on the side.