01 - Heat olive oil in a large saucepan over medium heat. Add the chopped onion and minced garlic, sautéing until softened and fragrant, approximately 3 minutes.
02 - Add the diced potato and broccoli florets to the saucepan, stirring to coat evenly with oil. Continue cooking for 2 minutes.
03 - Pour in the vegetable broth and bring to a rolling boil. Reduce heat to low, cover, and simmer for 15 to 18 minutes until all vegetables are fork-tender.
04 - Remove the saucepan from heat. Using an immersion blender, purée the soup until completely smooth. Alternatively, transfer in batches to a countertop blender and blend until velvety.
05 - Stir in the cream and nutmeg if using. Return to low heat and warm gently without bringing to a boil. Season with salt and pepper to taste.
06 - Ladle the soup into warmed bowls. Garnish with reserved broccoli florets or a delicate swirl of cream. Serve immediately.