Step 1

Melt butter in a large pot over medium heat. Cook and stir onion and garlic in hot butter until softened and browned, 10 to 15 minutes.

Step 2

Stir chicken broth, squash, curry powder, salt, cumin, and cayenne pepper into onion mixture. Bring mixture to a boil, reduce heat to low, and simmer until squash is tender, about 15 minutes. Remove from heat. Stir half-and-half and honey into squash mixture.

Step 3

Pour squash mixture into a blender no more than half full. Cover and hold lid down; pulse a few times before leaving on to blend. Puree in batches until smooth. Ladle soup into serving bowls and top with a dollop of sour cream.