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 cumin seeds, sautéing until they become fragrant and begin to sizzle.
Add the ground turkey, finely diced potatoes, minced ginger, and minced garlic to the skillet; cook until the turkey is browned and the potatoes are fork-tender.
Stir in the green peas, garam masala, turmeric, sea salt, and black pepper, cooking for an additional 2 minutes to meld the flavors before removing from heat.
Cut the large whole wheat tortilla into four equal wedges.
Place a portion of the turkey and potato mixture onto the center of each tortilla wedge, fold into a triangle shape, and dampen the edges with a little water to seal them shut.
Arrange the samosas on the prepared baking sheet and bake for 10-12 minutes until the exterior is golden brown and crispy.
While the samosas bake, whisk together the Greek yogurt, chopped cilantro, and lemon juice in a small bowl to create the cooling chutney.
Serve the warm samosas immediately with the chilled yogurt chutney on the side for dipping.