Preheat oven to 375°F. In a large skillet over medium heat, cook the Italian sausage, onion, and bell peppers together, breaking up the sausage with a wooden spoon. Cook until the sausage is browned and the vegetables are softened, about 8-10 minutes.
Add minced garlic and cook for another minute until fragrant.
In a large mixing bowl, combine the cooked sausage and vegetable mixture, uncooked rice, chicken broth, diced tomatoes with their juice, oregano, basil, paprika, salt, and pepper. Stir well.
Transfer the mixture to a 9x13 inch baking dish. Cover Lightly with aluminum foil and bake for 45 minutes.
Remove from oven, uncover, and stir the casserole. Sprinkle shredded cheese over the top.
Return to the oven, uncovered, and bake for an additional 15 minutes or until cheese is melted and bubbly.
Let stand for 5 minutes before serving. Garnish with chopped fresh parsley, if desired.