Name This Food

Updated with info from Cindy + pointing out something I missed in the instructions.

Today my coworker Cindy and I made something delicious. The idea was all hers; all I added was the banana peppers to mine. Are these a thing? If so, what are they? If not, how did nobody think of this before?

Ingredients:

• Buttery croissant dough stuff (I'm trying to find out exactly what it was from Cindy, will update when I hear) Update: Pillsbury crescent rolls, extra large style. Update 2: Pillsbury Crescent Rolls, Big and Buttery 50% Bigger style, to be more specific. And the butteriness is vital.
• Maple-honey-baked ham
• Provolone cheese
• Horseradish mustard
• Banana peppers (optional)

Stretch out 2 of the croissant dough pieces. Pierce each with fork. Lay one down on a sheet, and layer on ham, cheese, and peppers. Update: Spread mustard on the other piece. Place that piece over the top, and seal the edges (and crimp with a fork). Bake at 350 F for 15 minutes. Eat, and be contented.

They weren't quite pierogis. Were they a thing? Note: If you make this a thing, you can use virtually any sandwich ingredients. For that reason, I am temporarily calling them "dumpling sandwiches," although I guess "Cindy's Dumpling Sandwiches" (or whatever else she might decide to call them) would be more fitting.