To a large pan on the stove over medium high heat add in the olive oil once the oil is hot add in the chicken, cook the chicken until it is almost completely cooked through stir in the taco seasoning, tomato sauce, water, and cream cheese simmer for 5 minutes and let the chicken completely cook through at this point stirring occasionally.
Spray 9 x 13 baking dish with nonstick spray add the chicken sauce mixture in the pan and spread out.
Pour the cans of black beans and corn all over the top then sprinkle with the cheese. To a smaller sized bowl add in the corn muffin mix, milk, and egg. Stir well. Carefully spread over the top of the casserole.
Bake for 30 minutes. Top with your favorite enchilada toppings.