In a 3½- or 4-quart slow cooker, combine the vegetable broth, edamame, sweet potatoes, carrots, garlic, curry powder, cumin, and ginger.
Stir everything together.
Cover the slow cooker and cook on the low-heat setting for 4½ to 5 hours or on the high-heat setting for 2 to 2½ hours, until the vegetables are tender.
If you used the low-heat setting, turn the slow cooker to high.
Stir in the uncooked instant brown rice.
Cover and cook for an additional 10 to 15 minutes, or until the rice is tender and has absorbed most of the liquid.
Gently stir in the coconut milk and fresh cilantro.
Serve warm, sprinkled with chopped cashews.
Add delicate fresh herbs like cilantro at the very end of cooking to preserve their bright flavor and color.
Don't have instant brown rice? You can cook regular rice separately on the stovetop and serve the curry over it. Just skip adding rice to the slow cooker in step 3.