In a large skillet, heat 2 tablespoons of vegetable oil over medium heat.
Add the sliced sausage to the skillet and cook for 3-4 minutes until it starts to brown. Then, add the chopped onion and bell pepper to the skillet. Sauté for another 3-4 minutes until the vegetables begin to soften.
Stir in the minced garlic and rice, cooking for 1-2 minutes until the rice is lightly toasted.
Sprinkle the Cajun seasoning over the ingredients and stir to combine. Pour in the can of diced tomatoes (undrained) and chicken broth. Stir well to combine all the ingredients. Bring the mixture to a boil.
Reduce the heat to low, cover the skillet, and let it simmer for about 15-20 minutes or until the rice is tender and most of the liquid is absorbed. Stir occasionally to prevent sticking.
Gently fold in the peeled and deveined shrimp. Cover the skillet and cook for an additional 5-7 minutes, or until the shrimp turn pink and opaque.
Adjust the seasoning with salt, black pepper, or more Cajun seasoning if desired.
Serve hot and garnish with chopped green onions or fresh parsley if desired.