Add olive oil to large stock pot. Bring to shimmer over medium high heat
Add in smoked sausage and bacon until bacon is crispy and sausage is seared on both sides
Remove meat from stock pot with slotted spoon and place on a paper towel lined plate; Drain most of the fat from the pot, leaving enough to cover the bottom
Add in onion, celery, and bell pepper; sauté in remaining fat until soft
Add in garlic and cook until fragrant – approximately 30 seconds
Add in butter until melted
Stir in flour over veggies until coated; cook flour, stirring constantly, for 1-2 minutes until golden brown and flour no longer has smell
Add in chicken stock and stir, scraping brown bits from the bottom of the pot to de-glaze
Add in water, beans, meat, bay leaves, and Cajun seasoning and stir together.
Bring mixture to a boil and reduce to simmer. Cover and let simmer for 3 ½ to 4 hours
Remove cover and bring back to boil. Boil for 10 more minutes to reduce
Serve over cooked rice. Garnish with fresh flat leaf parsley if desired