In a large mixing bowl, whisk together flour, sugar, and salt. Make a well, add eggs, and whisk in milk until smooth. Add melted butter and let rest for 20-30 minutes.

Preheat a nonstick skillet over medium heat, greasing lightly if needed. Test with a drop of water; it should sizzle.

Pour ¼ cup of batter into the skillet, swirling to spread evenly. Cook until edges lift and bottom is golden, then flip and cook for 30-60 seconds.

Continue cooking, stacking the crepes on a plate. Keep warm in a low oven if necessary.

Spread Nutella on half of a warm crepe, add banana slices, and fold or roll to encapsulate the filling.

Arrange crepes on a serving plate, dust with powdered sugar, and add optional toppings. Serve warm.