Preheat oven to 375 F and prepare a 13x9 inch baking dish with natural cooking spray.
Lightly brown meat in a large skillet on med-high heat, add in the chopped onion and green pepper to cook in with meat, stirring occasionally. Drain meat, if necessary and return back to skillet.
Add in salsa, corn, black beans and seasonings; mix well.
On the bottom of the baking dish; first layer about 3 corn tortillas, then half of the meat mixture, and then half of the cottage cheese. Continue process a second time and then sprinkle the top with olives and cheese (if using).
Bake at 375 F for 30 mins.