Step 1

Line an 8x8- or 9x9-inch square baking pan with aluminum foil and spray very lightly with cooking spray. Remove rolls from packaging without separating them and slice in half horizontally with a serrated knife.

Step 2

Place both bottom portions of rolls side-by-side in the bottom of a 9x9-inch square pan. Layer ham, turkey and cheese evenly over rolls and then place the tops of rolls on cheese.

Step 3

Whisk together butter, egg and Dijon mustard. Pour over tops of buns. Cover rolls with tented foil (don’t let the foil touch the buns), and bake at 350 degrees F for 20 minutes.

Step 4

Uncover and continue to bake for 10 more minutes. Remove and let rest for another 10 minutes.

Step 5

Cut and dust with powdered sugar before serving.