Slow Cooker Butternut Squash Soup

• 2 lb medium butternut squash (910 g), peeled, seeded, roughly chopped
• 1 medium yellow onion, roughly chopped
• 4 cloves garlic
• olive oil, to taste
• 3 cups vegetable broth (720 mL)
• ½ teaspoon ground ginger
• ½ teaspoon ground cumin
• ½ teaspoon ground coriander
• ½ teaspoon paprika
• ⅛ teaspoon cayenne pepper
• 1 ½ teaspoons sea salt
• ¼ teaspoon black pepper
• ½ teaspoon fresh thyme
• ¼ cup coconut milk (60 mL)

Optional Garnishes

• pumpkin seed
• fresh chive, chopped