• Preheat the oven to 400 degrees.
• Line 2 baking sheets with parchment paper.
• Unfold one sheet of puff pastry over a clean space (counter or cutting board). Smooth out the dough by rolling with a rolling pin, but not too thin. Next, spread 1 tablespoon Dijon mustard over the pastry using a spreader or scraper.
• Lay down 8 slices of ham on top of the mustard, followed by 6 slices of Swiss cheese.
• Repeat with the other puff pastry, following the exact same process. You will have 2 baking sheets ready for rolling and making the pinwheels.

Make 12 pinwheels:

• Starting at one edge of the pastry, tightly roll up the dough into a log. Using a serrated knife, slice the log into 4 pieces, and then slice each quarter into 3 (to make 12).. Repeat with another sheet of pastry and the rest of the ingredients.
• Baking: Place 12 pinwheels on each baking sheet, cut side up, and bake until the puff pastry has turned golden brown, about 20-25 minutes.
• Remove from the oven and let cool for 5 minutes.
• Transfer to a serving platter and dust the pinwheels with powdered sugar.
• Serving: Place strawberry jam in a small dish in the center of a platter. Set out the 24 pinwheels around it (it’s okay to stack them), and serve with the jam for dipping.