When using the slow cooker, I like to use the low setting whenever possible. The reason for this is that some slow cookers cook quite hot, and on high, they can vigorously boil and overcook the ingredients. u003cbr/u003eu003cbr/u003eWith that being said, you can try cooking on high heat for 4-5 hours; check to ensure the sweet potatoes and onions are softened and quinoa is cooked through.