Heat the oil in a large skillet over medium heat.
Add the onion, celery, and bell pepper to the skillet and sweat down (about 5 minutes). Add the garlic and sautee for 1 additional minute.
Add the diced tomatoes, tomato sauce, hot sauce, Cajun seasoning, bay leaf, and salt. Bring to a boil. Once boiling, cover and reduce to a simmer. Let simmer for 15 minutes.
Make a slurry with the corn starch and water. Add to the skillet and stir. Let simmer for an additional 5 minutes.
Add the shrimp and stir. Cover and cook for 5-6 minutes or until shrimp is opaque and cooked through (internal temp 145 ℉).
Serve with cooked white rice and garnish with chopped green onion and/or parsley. Enjoy!