Heat oil in a large skillet over medium heat. Add ginger (and garlic if using) and cook for 30 seconds until fragrant
Add chicken, turmeric, and sea salt. Cook for 5–7 minutes until chicken is browned and nearly cooked through
Pour in coconut milk and bring to a gentle simmer. Reduce heat and let cook for another 10–12 minutes until the chicken is tender and the sauce thickens slightly
Stir in spinach and cook for 1–2 minutes until wilted
Remove from heat, squeeze in lime juice, and garnish with cilantro or green onion if desired
Serve warm with a side of roasted sweet potatoes, cauliflower rice, or enjoy as-is