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. Cook for an additional 2 minutes.
03 - Pour in the vegetable broth and bring to a rolling boil. Reduce heat to low, cover with a lid, and simmer for 15 to 18 minutes until all vegetables are fork-tender.
04 - Remove the saucepan from heat. Using an immersion blender—or working in careful batches with a countertop blender—purée the soup until completely smooth and velvety.
05 - Stir in the heavy cream and a pinch of nutmeg if desired. Return to gentle heat, warming through without bringing to a boil.
06 - Adjust salt and pepper to taste. Ladle into warmed bowls and garnish with reserved broccoli florets or a delicate swirl of cream.