Heat olive oil in large pot.
Add diced onion and carrots.
Cook vegetables for 5 minutes.
Add cubed butternut squash pieces.
Pour vegetable broth over vegetables.
Bring mixture to rolling boil.
Reduce heat and simmer 30 minutes.
Squash should be fork tender.
Remove pot from heat completely.
Blend soup until completely smooth.
Stir in heavy cream gradually.
Add salt, pepper, and nutmeg.
Taste and adjust seasoning accordingly.
Serve hot with butter dollop.