In a large mixing bowl whisk the flour, sugar, and salt until combined. Then create a well with dried ingredients and add the eggs. Gradually pour in milk, whisking to combine after each addition.
The batter should be fairly fluid. If it seems too thick, add a little more milk. Then add the melted butter, mix well. Let the batter stands at room temperature until slightly bubbly on top, 30 to 60 minutes.
Heat a non-stick pan. Add butter to coat. Pour 2-3 tablespoons of batter into the center of the pan and swirl to spread evenly. Cook for 2 minutes, then flip and cook 1 minute more.
Lay them out flat so they can cool. Continue until all batter is gone. After they have cooled you can stack them and store them in sealable plastic bags in the refrigerator for several days or in the freezer for up to two months. When using frozen crepes, thaw on a rack before gently peeling apart.