Creamy Pumpkin Soup

My mother-in-law makes this every fall for me, because she's awesome. Absolutely heaven and perfect for this time of year!

• 1/4 cup butter
• 1 large onion, chopped
• 1 (16 oz) can pumpkin puree
• 2 cups half-and-half
• 2 1/2 cups chicken stock
• 1/2 tsp curry powder
• 1/2 tsp cinnamon
• 1/2 tsp nutmeg
• 1 tsp salt or more to taste

Melt butter in a saucepan. Add onions and cook until soft. Add curry powder and cook 1-2 minutes more. Add chicken stock, pumpkin, cinnamon and salt and bring to a simmer. Reduce heat. Using an immersion blender, process until smooth. Add half-and-half. Stir until heated through. Top with extra cinnamon, a dollop of sour cream, and chopped parsley.