To a bowl, add the chicken thighs, sea salt and curry powder. Mix everything together.
Place a large frying pan over medium–high heat. Add the olive oil and let it heat for 30 seconds. Sear the thigh fillets for 2 minutes each side to develop a crust and caramelise. Remove and place straight into the slow cooker. Add the onion to the slow cooker.
For the satay sauce: Mix all the ingredients in a bowl and pour over the chicken in the slow cooker. Stir well to combine.
Cook on low for 6–7 hours or on high for 4–5 hours. About 1–2 hours before finishing, remove the lid and add the capsicum, pumpkin and green beans. Give them a good stir and get them under the liquid. Feel free to add a little more coconut milk here if needed.
Serve the satay chicken on steamed rice. Top with some crushed peanuts and sliced spring onion, if you like.