In a slow cooker, combine squash, potato and chickpeas.
In a frying pan, heat oil over medium heat.
Fry onion, garlic and ginger, stirring occasionally, until light golden brown.
Add curry paste, stir and cook for about 1 minute.
Add onion mixture to slow cooker.
Add coconut milk to frying pan, scraping up any bits and pour milk into slow cooker.
Add vegetable stock to slow cooker, and then stir in cashew butter and salt.
Cover slow cooker and cook on low for 4 hours.
Usually you do not take the lid off a slow cooker and disturb, however I found that do to the thickness of the curry, stirring every once in awhile is better.
15 minutes before serving, stir in swiss chard and peas.
Cover and cook on high for 15 minutes.
It is ready to serve.
I served this dish over a basmati rice.