Clean and cut chicken thighs into bigger cube and season lightly with salt and pepper.
On a frying pan heat up 1 tbsp of olive oil and brown the chicken lightly. Transfer to the slow cooker and add tikka paste, water, tomato sauce and puree, garlic powder, lemon juice, cardamom, and cinnamon. Give it all a good mix and cover the pot with a lid.
Let the sauce cook for 4 to 5 hours. 30 min before serving add double cream. You can add more up to your liking. Mix it carefully not to tear chicken cubes apart.
Serve with freshly chopped coriander with a side of rice.