Harvest squash and pear soup

Ingredients

• 1-kg bag frozen chopped squash , or 1 butternut squash, peeled and cubed
• 796-mL can pear halves , in their own juice, drained and coarsely chopped
• 1 large onion , coarsely chopped
• 2 1/2 cups water
• 284-mL can undiluted chicken broth
• 1 tsp garlic powder
• 1/2 tsp cinnamon
• 1/2 tsp ground ginger
• 1/2 tsp salt
• 1/2 tsp black pepper
• grated parmesan , optional