Once everything is prepped, grease the inside of your slow cooker for easy cleanup. Then, add the sausage, chicken, diced bell peppers, onion, jalapeños, chicken broth, crushed tomatoes, minced garlic, Cajun seasoning, salt, and pepper. Give everything a good stir to combine all the ingredients together. The seasoning and broth will create a rich, flavorful base for your jambalaya.