To make a 9x13 pan, double all ingredients, and follow the same instructions for baking. You could also double the recipe and make 2 smaller casseroles. Place each half in an 8x8-inch pan. One of those pans can be a disposable foil pan that you tightly cover with foil, label, and place in the freezer for a future meal.
Nutrition values are estimates only, using online calculators. Please verify using your own data.