Peel the pumpkin skin and scrape out the seeds. Cut into 4cm / 1.5" chunks. (Note 1)
Preheat the oven to 220C/430F (standard) or 200C/390F (fan/convection). Spread the squash on the baking sheet and bake for 20 minutes.
Cut the bacon into slices. Cut all the vegetables to the right size.
Heat the pot, add the bacon slices and fry them until golden brown.
Add the onion and stir fry until translucent. (Note 2)
Add carrots and stir fry for 2 minutes, add garlic and stir fry for 1 minute. (Note 3)
Add potatoes and stir fry for 2 minutes, add roasted squash, chicken broth, water and bay leaf. (Note 3)
Cover pot and cook until potatoes are tender, about 5 minutes.
Remove from heat and remove bay leaf, mash with a hand blender until smooth.
Season to taste with salt and pepper and stir in the cream (never cook the soup if you add the cream or it will break down).