Step 1: Prepare rice according to package directions.
Step 2: In a medium saucepan, melt the butter over medium heat. Add the onion, garlic, and bell pepper, and cook until softened and fragrant.
Step 3: Combine the kidney beans, sausage, water, bay leaf, Cajun seasoning, salt, and pepper into the saucepan and bring to a boil. Reduce heat to low and simmer for 10 minutes.
Step 4: Stir in rice and enjoy.