Creamy zucchini basil soup sings brings together the best of summer flavors. It's thick and rich, and a delicious addition to any low carb meal. Serve it hot or chilled!
Heat the oil in a large pot over medium heat. Add the celery and onions, and sprinkle with salt and pepper. Sauté until tender, about 4 minutes.
Add the garlic and red pepper flakes and cook another minute until fragrant. Then add the zucchini and toss to coat. Sauté until the zucchini is beginning to soften, another 4 minutes or so.
Add the broth and bring to a simmer. Cook until the zucchini is nice and tender, 15 to 20 minutes.
Remove from heat and stir in the basil and Parmesan. Let the basil wilt a bit, then blend the soup in a blender or with an immersion blender. (You may need to work in batches if transferring to a larger blender).
Stir in the heavy cream, and season with additional salt and pepper to taste.
Notes
Storage Information: Store the soup in a covered container in the fridge for up to 5 days. It can also be frozen for several months.