In a large pot or pan, heat 2 tablespoons of vegetable oil over medium heat. Add the chopped onion and sauté until it becomes translucent.
Add the minced garlic and grated ginger to the onions. Sauté for another minute until fragrant.
Stir in the ground cumin, ground coriander, ground turmeric, and curry powder. Cook the spices for about a minute to release their flavors.
Add the marinated vegan chick'n pieces to the pot. Cook for a few minutes until they start to brown slightly.
Pour in the coconut milk and canned diced tomatoes. Stir well to combine.
Add the sliced red and green bell peppers, as well as the diced potatoes. Mix everything together.
Cover the pot and let the curry simmer over medium-low heat for about 20-25 minutes, or until the potatoes are tender.
Check the seasoning and add salt as needed.
Once the curry is cooked and the flavors have melded together, remove from heat.