Cook chicken mixture: In a large skilled over medium-high heat, sauté bell pepper and onion 5 minutes or until tender. Stir in chicken and next 7 ingredients; remove from heat.
Assemble casserole: Layer one-third of torn tortillas in bottom of a lightly greased 13- x 9-inch baking dish. Top with one-third of chicken mixture and ⅔ cup cheese. Repeat layers twice.
Bake casserole: Bake at 350°F for 30 to 35 minutes.
