Melt the butter in a pan on low or in the microwave.

Make the crêpe batter: In a large mixing bowl, whisk together the flour and the egg. Gradually add in the milk and sparkling water, stirring to combine. Add the salt and butter; beat until smooth.

Heat a griddle or frying pan over medium-high heat.

Brew and prepare the coffee to your liking.

Cook the crêpes: Lightly grease the griddle or frying pan with nonstick spray. Pour or scoop the batter onto the pan, using approximately 1/4 cup for each crêpe. Tilt the pan with a circular motion so that the batter coats the surface evenly. Cook the crêpe for about 2 minutes, until the bottom is golden brown. Loosen with a spatula, turn, and cook the other side until golden brown. Repeat for remaining crêpes.

To finish the crêpes: Spread Nutella inside the crêpe shell, then add in the banana and fold into quarters or roll up.

Serve crêpes with melon, and coffee.