Heat a dutch oven or med sized soup pan over med-high heat. Add oil and sauté onion until sweating, about 2 mins. Add diced potatoes, sauté for another 2-3 minutes. Add tomatoes, chicken, garlic, spices, salt, coconut milk and lime juice. Bring to a slow simmer stirring occasionally, about 5 mins. Cover and reduce heat to med-low. Simmer for 20- 25 mins stirring occasionally.