This is a really great and easy meal that is very customizable. What really took this casserole over the top was adding some crushed nachos on top for a great texture difference and a nice little pop of salt but you could put anything on top to change the texture and taste. This is also surprisingly good the next day so it might be better as a make ahead meal where you just heat it up and place extra toppings on it before serving.
Tex Mex Casserole
In a 9 x11 baking dish mix together the oil, onions, bell peppers, cumin, and salt. then bake at 200°C for 10-15 minutes or until the onions start to color at the edges.
Remove the dish from the oven then add all of the other ingredients except for the toppings. Stir well and bake for 30 minutes.
Remove from the oven, fluff the rice then top with cheese and put back in oven until the last amount of water is absorbed and the cheese has melted about 5-8 minutes.
Remove from oven and garnish as desired.