In a mixing bowl, combine the flour, eggs, milk, melted butter, sugar, vanilla extract, and salt. Whisk until the batter is smooth and free of lumps. Let it rest for about 10 minutes.
Heat a non-stick skillet or frying pan over medium heat. Lightly grease with butter or oil.
Pour about ¼ cup of the batter into the skillet, tilting the pan to create a thin, even layer. Cook for approximately 1-2 minutes until the edges start to lift and the bottom is lightly golden.
Flip the crepe using a spatula and cook for another 1 minute. Remove and place on a plate. Repeat until all the batter is used, stacking the crepes on the plate.
In a blender or food processor, combine the sliced strawberries, mascarpone cheese, powdered sugar, and vanilla extract. Blend until smooth and creamy.
To serve, take a crepe, add a generous scoop of the creamy filling in the center, and fold over. Optionally, top with extra strawberries or a dusting of powdered sugar. Enjoy!