Brown ground beef in large skillet; drain. Add corn and salsa; cook until thoroughly heated. Reserve 2 TBS olives; stir remaining olives into beef mixture.
Combine cottage cheese and sour cream in bowl. In 2-quart casserole, layer 2 cups chips, half of meat mexture, 3/4 cup cheddar cheese and half of cottage cheese mixture. Repeat layers; cover.
Bake in preheated 350F oven 35 minutes. Line edge of casserole with remaining 1 cup chips; top with tomato, reserved 2 TBS olives and remaining 1/2 cup cheddar cheese. Bake 10 minutes or until cheese is melted and chips are hot.