Ham and Cheese Stuffed Crepes

Name: Ham and Cheese Stuffed Crepes
Ingredients: FOR THE CREPES:; 16 ounces, weight Eggs (about 8 Large Eggs); 16 ounces, fluid Whole Milk (2 Cups); 8 ounces, weight (1 3/4-2 Cups) All-purpose Flour; 2 Tablespoons Minced Fresh Parsley (or 2 Teaspoons Dried Parsley); 2 Tablespoons Minced Fresh Onion (or 1 Teaspoon Dried Granulated Onion); Hearty Pinch Of Salt; Melted Butter For Cooking; FOR THE STUFFING:; 2 Tablespoons Dijon Mustard; ½ cups Mayonnaise; 36 slices Paper Thin Deli-style Ham; 12 slices (thin) Swiss Cheese; ½ cups Finely Shredded Melting Cheese (Cheddar, Monterey Jack, Etc.), Or More As Needed