Whisk the flour, sugar and salt together in a mixing bowl.
Mix the milk, eggs and vanilla together.
Gradually add the milk mixture to the dry ingredients, whisking until smooth.
Melt the butter in a crepe pan. For a deeper flavour, allow the butter to brown before whisking it into the batter.
If the pan needs more butter, give it a quick coat.
Spoon on a 4oz ladle of batter, swirling the batter around the pan for an even distribution.
When the edges look like they're crisping up, work around the edge of the crepe with a spatula to loosen it from the pan, then give the crepe a flip.
Position two slices of ham and a 1/4 cup of cheese to the far end of the crepe. Let it sit for 30-60 seconds, then carefully roll it up.
Repeat steps 5-8 until all the batter is used up.