Preheat the Oven: Preheat your oven to 375°F (190°C). Line a baking sheet with parchment paper.
Prepare the Crescent Dough: Roll out the crescent roll dough onto a clean surface and press the perforations to seal, creating one large rectangle.
Add the Fillings: Spread a thin layer of Dijon mustard over the dough if desired. Lay the ham slices evenly across the dough, followed by the Swiss cheese slices.
Roll the Dough: Starting from the short side of the rectangle, roll the dough tightly into a log.
Slice the Pinwheels: Use a sharp knife to slice the roll into 1-inch pieces. Place the pinwheels cut-side up on the prepared baking sheet.
Brush and Garnish: Brush the tops of the pinwheels with melted butter and sprinkle with sesame seeds for added flavor and texture.
Bake: Bake the pinwheels in the preheated oven for 12-15 minutes, or until golden brown and fully cooked.
Cool and Serve: Allow the pinwheels to cool slightly before serving. Enjoy warm for the best taste!