In a large pot, heat the olive oil over medium heat. Add the chopped onion and cook until soft and translucent, about 5 minutes.

Stir in the minced garlic and sauté for an additional minute until fragrant.

Add the diced potatoes and Cajun seasoning to the pot, stirring to coat.

Pour in the chicken or vegetable broth and bring the mixture to a boil. Reduce the heat and let it simmer for about 15 minutes, or until the potatoes are tender.

Using an immersion blender, carefully blend the soup until smooth. If you prefer a chunkier texture, you can mash some of the potatoes with a fork instead.

Stir in the heavy cream and let it gently heat through. Season with salt and pepper to taste, adjusting as needed.

Ladle the soup into bowls and garnish with your choice of green onions, sour cream, or shredded cheese. Enjoy your delicious homemade Creamy Cajun Potato Soup!