Not only are these peanut butter cookies delicious, but they are impossibly easy to make. Simply combine 1 cup of sugar, 1 cup of peanut butter, and one egg. Mix the three (yes three!) ingredients thoroughly and roll into small balls on a cookie sheet. Flatten the balls with the tines of a fork (old-school style) and sprinkle with Fleur de Sel. Bake at 350 degrees for 8 - 10 minutes.