Preheat oven to 350 degrees and spray two large baking sheets with cooking spray. Reserve.
Prepare the Dijon Mayo by combining the mayonnaise, Dijon mustard and parmesan in a bowl and mixing until smooth. Reserve.
Unroll dough onto a large cutting board or on your counter, pressing into a 12X8-inch rectangle. If you are using the rolls, press the seams together to seal.
Spread the Dijon mayo and top with ham and cheese, leaving a 1/4-inch border on the edges.
Roll up tightly into a log, starting on the short end of the rectangle and seal the seam. Repeat with the second dough sheet.
Cut each log into 8 slices, about 1-inch thick. Arrange them on the prepared baking sheet, leaving at least 1-inch space between them.
Brush with melted butter and sprinkle the chopped parsley and poppy seeds.
Bake in the preheated oven for 15-20 minutes or until golden brown.
Serve warm!