Creating Authentic Thai Yellow Chicken Curry with Potatoes is simple when you follow these steps:

1. Heat Oil: In a large pot or Dutch oven, heat the vegetable oil over medium heat.
2. Sauté Aromatics: Add the chopped onion, garlic, and ginger. Sauté until the onion is translucent and fragrant, about 3-5 minutes.
3. Add Curry Paste: Add the yellow curry paste to the pot. Stir well and cook for another 2-3 minutes to release the flavors.
4. Add Chicken: Add the chicken pieces to the pot. Stir to coat the chicken with the curry paste and cook for about 5 minutes until the chicken starts to brown.
5. Incorporate Coconut Milk: Pour in the coconut milk, stirring to combine. Bring the mixture to a gentle simmer.
6. Add Potatoes: Add the diced potatoes to the pot. Stir well and let the curry simmer for 20-25 minutes, or until the potatoes are tender and the chicken is cooked through.
7. Season: Stir in the fish sauce, sugar, turmeric, and cumin. Adjust salt and pepper to taste. Simmer for an additional 5 minutes.
8. Garnish: Remove from heat and garnish with fresh cilantro.
9. Serve: Serve hot with steamed rice or Thai jasmine rice.

These steps will lead you to an incredible curry that captures the essence of authentic Thai cuisine.