Start by slicing the chicken and sweet potatoes. Combine chicken with turmeric, ginger, and cayenne. Place in the crockpot with garlic, shallots, and fresh ginger slices.
Pour over the coconut milk and add fish sauce. Stir gently to coat all ingredients. Make sure sweet potatoes are submerged for even cooking.
Cover and cook on low for 4 hours or high for 2–3 hours. Add sweet potatoes later if cooking longer than 4 hours to prevent them from overcooking and turning mushy.
In a skillet, heat sesame or peanut oil. Fry shallots until golden and crisp, then stir in Thai red curry paste and fresh basil. This aromatic topping elevates the curry beautifully.
Spoon curry over steamed basmati rice. Drizzle with shallot basil oil, sprinkle fresh cilantro, and add a squeeze of lime for freshness. Optional: serve with naan bread to soak up sauce.