Preheat oven to 325F (163C).
Blend the egg whites and one pear (cored) for about 30 seconds.
Except for the other pear, add the rest of the ingredients and blend for another 30 seconds. Scrape down the sides of the blender with a spatula, if necessary, and blend again until well combined (another 30 seconds or so).
Pour batter into a 7" or 8" square pan, or any baking pan of similar size. (If you are not using silicone bakeware, be sure to line your pan with parchment paper.)
Slice the remaining pear and lay slices on top of the batter.
Bake for 30-40 minutes, until firm and a toothpick comes out clean.
Remove from oven and let cool.
Enjoy! Store in the refrigerator.