Boil the water with a tablespoon of olive oil in a pot.

Sift the whole wheat flour and cornstarch and sprinkle them into the boiling water.

Cook for 5 minutes, stirring continuously with a whisk.

Let the mixture cool down.

Beat the egg whites until stiff peaks form.

Chop the flesh of one peach.

Add the beaten egg whites, chopped peach flesh, and teaspoon of cinnamon to the cooled mixture.

Mix all the ingredients well.

Line a mold with the slices of the remaining 3 peaches.

Pour the mixture into the mold with the peaches.

Bake in a preheated oven at 160 degrees Celsius for 20 minutes.

Remove the peach flan from the oven and flip it onto a serving plate.

Serve the peach flan hot or at room temperature.