Dice the chicken breast into bite-sized pieces and slice the andouille sausage into rounds.
In a heavy-bottomed pot over medium heat, brown the sausage rounds for 3-4 minutes until the fats render, then remove and set aside.
Add the olive oil and cassava flour to the same pot, whisking constantly for 5-7 minutes until the roux reaches a dark caramel color.
Stir in the diced onion, bell pepper, and celery (the holy trinity) and sauté until the vegetables are softened and fragrant.
Slowly pour in the chicken bone broth while whisking to incorporate the roux without lumps.
Add the chicken, browned sausage, okra, creole seasoning, sea salt, and black pepper to the pot.
Reduce heat to low, cover, and simmer for 20 minutes until the chicken is cooked through and the gumbo has thickened.
While the gumbo simmers, steam the cauliflower rice in a separate pan until tender.
Ladle the hot gumbo over the cauliflower rice and serve immediately.