Press PRESSURE COOK then press SEAR and use default temp of 275°F. Add oil and heat up.
Add butternut squash and onions, cooking in batches, if necessary. Cook until browned and soft.
Add 2 sprigs sage, sea salt, freshly ground black pepper, ginger, nutmeg, and stock. Cook 15-20 min.
Place on Pressure Cooker Lid. Ensure the Pressure Release Switch/ Valve is in the CLOSE position. Press PRESSURE COOK and use HIGH pressure. Press TIME and turn START/PAUSE dial to adjust to 15 min. Press START/PAUSE to start cooking.
When done, perform a quick release.
After all pressure/steam has been released, remove Lid. Check to see if butternut squash is fully cooked. If not, add an additional 5 min. of cook time.
When done, using a stick blender (or removing and using a food processor), blend soup until thick and creamy. Garnish with pumpkin seeds and fresh sage. Serve immediately.