Preheat your oven to 220 degrees C or 425 degrees F.
On your oven-roasting dish, place the pumpkin, carrots and onions. Drizzle olive oil over the top.
Cook in the oven for 40 minutes. Bake until soft but not burnt.
Boil water and crumbled stock cubes in a large saucepan on medium heat.
Cook the potato in boiling water. Cook for approximately 20 minutes or until it is soft to the touch.
In a food processor, add the potato. Then add the water mix and the roasted vegetables. Blend them until they become smooth.
Pour the mixture into the saucepan placed on low heat. Add in cream, nutmeg, pepper, and salt. Stir until the ingredients are fully mixed.
Serve!