Crockpot Butter Chicken

Name: Crockpot Butter Chicken
Ingredients: 1 tablespoon coconut oil; 3-4 cloves garlic, crushed; 1 onion, diced; 1 + ¾ cups coconut milk; ¾ cup organic tomato paste; 2 tablespoons tapioca flour; 2 teaspoons garam masala; 1 teaspoon curry powder; ½ teaspoon ginger powder; ½ teaspoon chili powder (add more if you like it hotter); Sea salt and black pepper, to taste; 1.25kg chicken thighs (or breasts), cut into small pieces (I use free range chicken, Lillydale brand); Fresh coriander, to serve