What is a good substitute for rotel?

To substitute Rotel, combine canned diced tomatoes with canned diced green chilies. A ratio of one 14.5-ounce can of diced tomatoes to one 4-ounce can of diced green chilies typically works well. You can also add a pinch of cayenne pepper or finely minced fresh jalapeño for extra heat and flavor, adjusting to your preference.