Blend soup and 2 packages of chestnuts together. (If using an immersion blender, work in a deep container. This will get messy otherwise.) Transfer to a sauce pan and add seasonings and optional brown sugar. Bring to a simmer and adjust spices to taste.
At this point you can freeze or refrigerate the sauce if you’d like to serve it at a later date.
When ready to serve, prepare gnocchi according to package direction. Combine with sauce. Slice remaining chestnuts and add.
Recipe by Between Carpools at https://betweencarpools.com/the-perfect-fall-yom-tov-dish-gnocchi-with-butternut-squash-and-chestnut-sauce/