Bring a large soup pot to medium heat and add a splash of vegetable broth or neutral cooking oil. Add the onion and apple, then sauté until the onion is translucent, 3 to 5 minutes.

Add in the garlic, rosemary, sage, and a pinch of salt. Sauté for an additional 1 to 2 minutes, then add in the squash, coconut milk, and vegetable broth.

Raise the heat to high and bring the mixture to a boil, then reduce the heat to medium-low and simmer uncovered for 10 to 12 minutes, until the squash is fork-tender. Carefully use an immersion blender to blend the soup until smooth, or transfer to an upright blender and blend on high speed to do the same.

Serve as desired; leftovers will keep in the fridge for up to 5 days, or can be frozen for up to one month.