Jonathan's Broccoli Soup

• 1 onion (diced)
• 1 clove garlic (minced)
• 1 baking potatoes (diced)
• 950 ml chicken broth defatted
• 525 gr broccoli see note (chopped)
• 120 ml cream (heavy)
• 30 ml oil
• 14 gr cheddar cheese
• 1 gr sage rubbed
• 1 package puff pastry shell (frozen)