Preheat your oven to 375°F. Line a baking sheet with parchment paper.
Mix together the sandwich sauce in a small mixing bowl. Whisk Dijon mustard, whole grain mustard, honey, and red pepper flakes in a small mixing bowl.
Roll out on of the packages of dough on the parchment paper. Spread ½ the sauce over the dough.
Place a slice of Swiss cheese on the sauce. Add a generous portion of deli meat on top of the cheese. Top with the remaining hot honey mustard spread.
Add the top layer of crescen roll. Brush the tops of the croissants with the beaten egg. Optionally, sprinkle sesame seeds or poppy seeds on top for added texture. Slice along the perforated edges using a pizza slicer into 8 sandwiches, before it goes into the oven.*
Place the baking sheet in the preheated oven and bake for 20-25 minutes or until the croissants are golden brown and the cheese is melted. (If the top is getting too dark, cover with the aluminum foil to finish baking.)
Remove from the oven and allow the baked croissant sandwiches to cool for a few minutes before serving.
Notes
Slicing instructions
If you'd prefer, after slicing along the perforated edges, slice again in half. These make great party appetizers and tasty bites!
Storage
Refrigerate - Allow the sandwiches to cool completely. Wrap in aluminum foil or parchment paper and refrigerate up to three days.These also freeze well. Freeze in a single layer, wrap tightly in plastic wrap, then aluminum foil. Label and freeze up to 3 months. Thaw overnight in the refrigerator.