- Bake the squash until done. 
- In la arge pot melt butter add potatoes and onion. 
- Cook until the onion is translucent. 
- Add minced garlic 
- Cook for a minute or two or until fragrant. 
- Add the chicken broth, rosemary, and salt...simmer about 20 minutes 
- Add the cooked squash, cover the pan and bring back to boil. Remove from heat. 
- Use an immersion blender and blend everything until smooth. 
- Stir in 1/2 and 1/2. 
- Serve warm.