Season shrimp with 2 teaspoon of Cajun seasoning and set aside.
Cook rice according to package instructions until tender and fluffy.
Heat butter in a large, deep skillet over medium high heat. Add onion and bell pepper and cook until tender and onion is translucent, about 5 minutes. Add garlic and cook until fragrant, 1-2 minutes. Add broth and stir to break up any bits stuck to pan. Add tomatoes. Season with Cajun seasoning (start with a teaspoon and increase to taste) and black pepper and continue to cook 2-3 minutes.
Add shrimp to pan and cook until shrimp are opaque and just cooked through, about 5 minutes.
Notes
leftovers can be stored in an airtight container in the refrigerator for up to 3 days.