Preheat oven to 300°. Stir together uncooked oats, cereal, walnuts, banana chips, pineapple, coconut, oat bran, and salt in a small bowl. Microwave brown sugar, honey, corn syrup, olive oil, and vanilla in a large microwave-safe bowl at HIGH 1 minute. Pour warm honey mixture over oat mixture, stirring to coat. Whisk egg whites, and stir into oats mixture. Press into a lightly greased parchment paper-lined 9-inch square pan. Bake 50 minutes or until brown. Cool completely in pan on a wire rack (about 45 minutes). Cut into 16 squares.
Note: We tested with Fiber One for high-fiber cereal.