1. Preheat oven to 400°.
2. Combine 1 tablespoon oil and potatoes, tossing to coat. Set aside.
3. Heat remaining 2 1/2 tablespoons oil, mustard seeds, and chiles in a large skillet over medium-high heat; cook 1 1/2 minutes or until seeds begin to pop. Reduce heat to medium-low. Add ginger, garlic, and jalapeño to pan; cook 1 minute, stirring constantly. Stir in salt, turmeric, and Garam Masala; cook 1 minute, stirring constantly. Add spice mixture to potatoes, tossing to coat. Arrange potato mixture in a single layer in a 13 x 9–inch baking dish coated with cooking spray.
4. Bake at 400° for 40 minutes or until potatoes are tender and browned, stirring every 10 minutes. Stir in cilantro, mint, and juice. Serve with lime wedges.