Heat olive oil in a large pot over medium heat.
Add the diced onions and cook until translucent, about 5 minutes.
Stir in the minced garlic and cook for an additional minute until fragrant.
Add the Cajun sausage and cook until browned, approximately 6-8 minutes.
Add the diced potatoes and pour in the chicken broth, bringing the mixture to a boil.
Reduce the heat and simmer for about 15-20 minutes until the potatoes are fork-tender.
Stir in the heavy cream and Cajun seasoning, mixing well.
Season with salt and pepper, and get ready to serve!