Slice the squash in half lengthwise. Remove and discard the seeds.
Choose one of the following methods to cook your squash.
Once it's cooked, scoop the flesh into a food processor, blender, or baby food maker. Blend until smooth.
Roasted
Preheat the oven to 400 degrees F. Rub the flesh of the squash halves with a little bit of olive oil. Place them cut side down on a baking sheet lined with parchment paper.
Bake for 40 to 50 minutes, depending on the size of your squash, until the squash is tender and easily pierced with a fork.
Steamed
After halving and deseeding the squash, remove the skin and cut it into smaller pieces. Place the squash in a steamer basket over an inch of boiling water in a pot. Cover and let cook for 15 to 20 minutes until tender.
Instant Pot
Pour a cup of water in the bottom of an Instant Pot (6 quart size or larger). Put the squash halves on top of a trivet. Seal the Instant Pot and turn the vent knob to "sealing."
Pressure cook the squash for 7 minutes on high pressure. Then, let the pressure manually release for 10 minutes. Turn to the knob to "venting" to release any remaining pressure.
Notes
Store the squash puree in an airtight container in the fridge for up to 10 days. You can also freeze it in freezer-safe containers for up to 6 months.
Add to baked goods, soups, smoothies, yogurts, risotto, chili, and other recipes or use as baby food.