Add chicken, onion and garlic to a searing slow cooker (or fry pan) and sear/seal for 5-10mins. No need to brown chicken, just seal it and soften onion.
Combine all other listed ingredients in a jug and mix with a stick mixer or blender to thoroughly combine peanut butter through the coconut milk mix.
Pour over chicken and onion and garlic and turn back to slow cooking setting. (If used fry pan move to slow cooker now)
This produces a lovely thick strong satay sauce. You can reduce the peanut butter to ½ cup if you don’t like a strong peanut taste but we loved it exactly as it was in our family.
You can also swap crunchy peanut butter for smooth if you prefer and add 1/3 crushed peanuts before serving if you rather.
The 1 small chilli (without seeds) wasn’t spicy and our 5yr old happily ate this with no concerns