Brown ground beef in large skillet, drain. Add corn and salsa; cook until thoroughly heated. Reserve 2 tbsp olives; stir remaining olives into beef mixture. combine cottage cheese and sour cream in a small bowl.
In 2 quart casserole, layer 2 cups chips, half the meat mixture, 3/4 cup cheese and half of cottage cheesee mixture. Repeat layers; cover.
Bake in preheated 350 degree oven for 35 minutes. Line edge of casserole with remaining 1 cup chips; top with tomato, reserved 2 tbsp olives and remaining 1/2 cup cheese. bake 10 minutes or until cheese is melted and chips are hot.
I don't like hot tomatoes, so I sprinkle them on top after this is baked.