Squeeze the juice from half an orange to yield about 50 ml, including some pulp.

In a bowl, whisk together the egg and sugar until well combined.

Add the orange juice to the egg and sugar mixture and whisk again to incorporate.

Cut the bread into bite-sized pieces.

Soak the bread pieces in the orange-egg mixture, ensuring they are well saturated.

Melt the butter in a frying pan over medium heat.

Place the soaked bread pieces in the heated pan and pan-fry until golden brown on all sides.

Remove the French toast from the pan and place on a serving plate.

Sprinkle powdered sugar over the French toast using a tea strainer for even distribution.

Garnish with fresh mint leaves and serve immediately.