Tex mex casserole is an excellent main course that is relatively easy to prepare and does not take too much time. As per most of the Tex mex casserole recipes, the main ingredients used are cooked rice, chili beans, green chilies, corn, black olives, tomatoes, salt, garlic powder, chili powder, cheese, tortilla chips, parsley, grilled chicken and onions. To prepare Tex mex casserole, these ingredients need to be combined and baked in an oven at about 400 degrees F for about 15 minutes. Tex mex casserole is ready to be served and has a unique taste and flavor that makes it an extremely popular main course. The best part is that this dish contains a number of different ingredients but most of them can be replaced by other options depending on availability and individual preferences.