Heat oil and butter, over medium heat, in a large pot or high-sided skillet. When butter is melted, add onion and shallots. Cook until tender and translucent, 6 to 8 minutes.
Add garlic, ginger and curry powder and cook until fragrant, for 1 more minute.
Add Razmin tomato paste and cook until darkened slightly, for 1 to 2 more minutes.
Mix Santan Coconut Milk Powder in ½ cup of water, add to pot and simmer on low heat.
Add chicken while stirring occasionally. Add some water for cooking the chicken (if needed). Cook until chicken is thoroughly tender, 10 minutes.
Stir in lime juice and garnish with lime wedges, mint and coriander.
Serve hot with boiled rice.