This easy vegetarian recipe offers a fresh take on traditional pot pie. To serve, use a large spoon to cut sections of the pastry and scoop with filling into shallow bowls. If desired, serve chutney, yogurt, and chopped cucumbers on the side.
Melt butter in a large stockpot over medium heat. Cook and stir sweet onion, garlic, 1/2 teaspoon salt, and 1/4 teaspoon black pepper in hot butter until onion is translucent, about 10 minutes.
Stir carrots into the onion mixture; continue cooking and stirring until the carrot is slightly softened, about 5 minutes more. Add potatoes; stir.
Mix milk, half-and-half, 1/2 teaspoon salt, 1/4 teaspoon pepper, coriander, cumin, curry powder, garam masala, and ginger together in a bowl until the spices are dissolved into the liquid; pour over the vegetable mixture in the pot. Bring the mixture to a boil. Stir peas into the boiling mixture; cook until peas are warmed, 2 to 3 minutes. Pour contents of pot into a 13x9-inch baking dish.
Cut frozen puff pasty lengthwise into 3 even pieces; arrange atop the vegetable mixture.
Bake in preheated oven until the pastry is puffed and golden brown and the vegetables are tender, about 40 minutes.