Prep the veggies and set aside. Heat the olive oil in a large skillet over medium-high heat. Add the diced onion and cook 2-3 minutes. Add the rice, water, tomato paste, and diced tomatoes. Bring to a simmer, then reduce heat to medium.

Add the bell peppers, mushrooms, Cajun seasoning, paprika, cumin, crushed red pepper, and garlic. Stir well to combine. Cook for another 15-20 minutes, stirring occasionally, until the rice is fully cooked and nearly all liquid is absorbed.

While the rice is cooking, heat a smaller non-stick or cast iron skillet over medium-high heat. Carefully slice open the casing on the sausages and peel back to remove. Add the ground sausage filling to the pan and brown, breaking it apart with a spatula or wonder spoon. Continue until fully cooked, about 10 minutes, then add to the larger skillet with the rice mixture.

Stir well to combine. When rice is fully cooked, remove from heat and garnish with chopped fresh parsley or thinly sliced green onions. Serve hot.