Preheat oven to 375˚F.
Spray an 8x8 baking dish with cooking spray and set aside.
Roll out the refrigerated crescents dough and pinch together all the seams.
Arrange the cheese slices in a single layer over the dough.
Arrange the ham slices over the cheese.
Spread dijon mustard over the ham slices.
Starting with the side nearest you, carefully roll up the dough, tightly.
Using a sharp knife, cut the dough into 9 slices.
Transfer to previously prepared baking dish.
Spread basil pesto over the rollups.
Bake for 12 to 13 minutes, or until dough is golden brown.
Remove from oven and let stand for about 3 to 4 minutes.
Serve.