If desired, heat a large skillet over medium heat and brown the sliced smoked sausage for approximately 5 minutes, until lightly caramelized. This step is optional but enhances flavor.
Transfer the sausage to a slow cooker. Add the black-eyed peas, diced tomatoes with green chiles, beef broth, onion, bell pepper, Cajun seasoning, garlic powder, and black pepper. Stir gently to combine.
Cover and cook on LOW for 6 hours, allowing the flavors to fully develop.
Add the uncooked rice to the slow cooker and stir well. Cover and cook on HIGH for 20 minutes, or until the rice is tender.
Stir once more before serving. Serve hot.