Combine the pumpkin, onion, potatoes, vegetable broth, salt, pepper, cinnamon, nutmeg, ginger and cayenne pepper in a 6-quart slow cooker. Stir to combine.
2 pounds pumpkin, 2 medium yellow onions, 3 medium russet potatoes, 4 cups low sodium vegetable or chicken broth, 1 teaspoon kosher salt, ½ teaspoon freshly ground black pepper, 1/2 teaspoon ground cinnamon, 1/4 teaspoon ground nutmeg, 1/4 teaspoon ground ginger, 1/4 teaspoon cayenne pepper