Cut potatoes into 1/2-inch cubes. Place potatoes and broccoli in microwave-safe dish. In bowl, stir together tomatoes, soup, milk and Cajun seasoning. Pour over potatoes and broccoli. Sprinkle with cheese.
Cover tightly with lid or microwave-safe plastic wrap. Microwave on high for 20 minutes (cooking time may vary depending on your microwave) or until potatoes are done. Let sit for 2 minutes.
Use oven mitts or tongs to remove from microwave. Remove plastic wrap carefully to prevent burns from steam.
All materials courtesy of the Colorado Potato Administrative Committee. For more recipes and ideas for making potatoes part of your healthy diet, visit http://coloradopotato.org