Place the chicken pieces, cubed butternut squash, diced onion, minced garlic, and grated ginger into the slow cooker.
Sprinkle the curry powder, cumin, and turmeric over the ingredients. Add the diced tomatoes and chicken broth. Stir to combine everything evenly.
Cover and cook on low for 6 to 7 hours, until the chicken is tender and the squash is soft.
Stir in the coconut milk. Season with salt and black pepper to taste. Let the stew sit for 10 minutes to absorb the flavors.
Ladle the stew over cooked rice and top with chopped cilantro before serving.