In a large pot, heat the olive oil over medium heat. Add the diced onion and sauté until translucent, about 5 minutes.
Stir in the minced garlic and cook for an additional 1 minute until fragrant.
Add the chopped green olives and dried thyme to the pot, stirring to combine. Cook for another 2 minutes.
Pour in the vegetable broth and bring the mixture to a boil. Reduce heat and let it simmer for 15 minutes.
Using an immersion blender, blend the soup until smooth. If you don’t have an immersion blender, carefully transfer the soup in batches to a countertop blender.
Stir in the heavy cream and season with salt and pepper to taste. Heat the soup gently over low heat for another 5 minutes.
Serve hot, garnished with fresh parsley.