Preheat oven to 350°F. Crumble sausage into medium skillet. Cook over medium heat until browned, stirring occasionally. Drain off any drippings. Spread beans in ungreased 2-1/2-quart shallow baking dish, then top with sausage. Pour salsa over sausage; sprinkle with cheeses. Sprinkle olives and onions over top. Bake 20 to 30 minutes or until heated through. Spread with sour cream while hot and serve with chips. Refrigerate leftovers; reheat in oven or microwave.