In a large bowl, combine flour, eggs, butter, and sugar, stirring until ingredients are slightly mixed.
Add the milk ½ cup (120 ml) at a time, stirring vigorously, making sure the milk is completely incorporated into the batter and that the batter is smooth before adding more milk.
Repeat with the rest of the milk. The batter should be very liquidy and have no lumps.
In a pan over medium heat, pour ⅓ cup (95 grams) of the batter in the center and swirl the batter around the edges of the pan until set.
To know when the crepe is ready to flip, lift up one of the edges about ⅓ of the way. The bottom side should be golden brown. Flip the crepe.
Cook until the edges are starting to slightly crisp.
Remove from heat and cover with a paper towel to make sure the crepes stay moist.
Spread half of the chocolate hazelnut spread on half of the crepe.
Lay half of the strawberries on the chocolate spread.
Fold the other half of the crepe on top of the strawberries, then fold the crepe in half.