Steam butternut squash (3 pounds). I do this in a large pot with 1" of water and a steamer basket (squash goes in the basket). Then cover with a lid and steam until fork tender (about 13-15 minutes). Alternatively, you can do this in the microwave or without the steamer basket in a heavy bottom pot.
Remove steamer basket and water from the pot.
Melt butter (2 tablespoons) in pot over medium-high heat.
FOR SAVORY: Add minced garlic (1 teaspoon) and minced herbs (1 teaspoon) to melted butter. Saute until fragrant, about 2 minutes.
Remove from heat, and add butternut squash and salt (1 teaspoon).
FOR SWEET: Add brown sugar or erythritol (2 tablespoons), cinnamon (1/2 teaspoon) and nutmeg (1/4 teaspoon).
Mash using a potato masher, an immersion blender, or place ingredients in a high speed blender*.
Taste seasoning and adjust to your taste (I always add 1 more teaspoon of salt for savory). Enjoy!