1teaspoonDiamond Crystal kosher salt(or ½ teaspoon fine salt)
Place the butternut squash cubes in a large microwave-safe bowl. Add ½ cup water, cover, and microwave until tender, about 15 minutes. Drain well. Or, if using frozen butternut squash cubes, microwave them according to the package directions and drain.
Place the cooked butternut squash along with the remaining ingredients in your food processor. Process until smooth, 1-2 minutes, stopping to scrape the sides with a spatula as needed. Start processing on low, then process on high until smooth.
Serve the mashed butternut squash immediately. Keep leftovers in the fridge, covered, for 3-4 days.