Sprinkle chicken with salt and pepper; place in a 9x13” baking dish.
Bake at 325° for 40-45 minutes or until done; cool.
Coarsely chop chicken and set aside.
Melt butter in a large skillet over medium heat.
Add chopped onion and green pepper and cook, stirring mixture constantly, until vegetables are crisp-tender.
Remove from heat, and stir in chicken, tomatoes with green chilies, and soups.
Place one-third of tortilla quarters in bottom of a lightly greased 9x13” baking dish; top with one-third chicken mixture, and sprinkle evenly with 2/3 cup shredded cheese.
Repeat layers twice, reserving 2/3 cup cheese.
Bake at 325° for 35-45 minutes; sprinkle with reserved cheddar cheese, and bake additional 5 minutes. Let stand 5 minutes before serving.