Butternut Squash with Apples, Cranberries, and Walnuts

Melt butter in large skillet coated with nonstick cooking spray over medium heat. Add squash; mix to lightly coat with butter. Add brown sugar, cinnamon, salt, and pepper; mix with large spoon. Add water; cover, bring to a simmer. Reduce heat and simmer 10 minutes. Add apple and cranberries; mix to combine. Cover and simmer 10 minutes or until squash is tender. Add walnuts; mix gently.