In a large skillet, heat olive oil over medium heat. Saute zucchini, onion, and green peppers until they start to soften, about 5 minutes. Stir in olives, spinach, cumin, salt, and pepper until spinach starts to wilt. Once the spinach is all wilted, remove it from heat and stir in chicken, beans, salsa, and cilantro. This is the filling for the casserole. Set aside.
Spray a baking dish with non-stick cooking spray. {A 9x9 glass baking dish will be fine.} Spread 1/4 cup enchilada sauce across the bottom and place 1 layer of corn tortilla strips over top. Sprinkle some cheese over top. Spread half the chicken and veggie filling over the tortillas and cheese. Top with more cheese, more tortilla strips and 3/4 cup enchilada sauce.
Continue layering the lasagna with more cheese, the last 1/2 of the filling, more cheese, the remaining tortilla strips, 1 cup of enchilada sauce and the last bit of cheese.
Cover and bake at 350 degrees for 30-45 minutes. Remove from oven and cool 10 minutes before cutting and serving. Top with avocados, sour cream, avocados, tomatoes, etc.