Use homemade vegetable stock and/or yogurt if possible.
If you don't have a high quality vegetable peeler, it may be difficult to peel the squash. You can either put the squash and 2 tablespoons water in a slow cooker on High for the day, or quarter squash, place on a trivet in pressure cooker with 1 cup water, and cook at least 10 minutes.
Add carrots if desired.
You can also transfer in batches to a food processor or blender in step 3, but make sure that there is enough liquid in each batch.