Slice the zucchini into paper-thin circles. Bring a medium-sized pot of water to a boil over high heat. Boil the slices for 1 minute and remove from the water. Place the slices on a paper towel, and pat them dry to remove the excess water.
Put the slices into a large bowl, add the olive oil, and mix well. Add the mint leaves and the feta to the bowl and mix again.
Refrigerate the salad until chilled. Serve and enjoy!