Mix first three ingredients. Spread in 9 x 13 inch pan or Pyrex dish. Bake at 350F until brown. Cool. Crumble onto bottom of 9 x 13 inch serving dish. Mix remaining ingredients (except bananas and Cool Whip) well and spread over first layer. Top with sliced banana, then Cool Whip. Chili. Serve cold.
Serves 12.