Slow Cooker Roasted Butternut Squash Soup

Soup:

• 2 tablespoons olive oil
• 1 yellow onion diced
• 4 cloves garlic minced
• 1 tablespoon fresh ginger minced
• 4 cups low-sodium vegetable broth plus more if needed
• 1 cup heavy cream
• 6 cups diced butternut squash roasted or raw
• 1/2 teaspoon sea salt plus more to taste
• 2 tablespoons brown sugar
• 1/4 teaspoon ground nutmeg
• 1/3 teaspoon ground cinnamon
• 1/8 teaspoon ground cloves
• freshly ground black pepper

Toppings:

• chopped fresh cilantro
• pepita seeds
• drizzle of cream