Preheat oven to 425F. Line a large baking pan with parchment paper.

On a lightly floured surface, roll out the puff pastry sheets to 1/4" thick.

Place one sheet on the prepared pan.

In a small bowl, whisk the dijon mustard and maple syrup together. Brush over the puff pastry sheet.

Tear apart the ham and cheese with your hands to distribute evenly over the puff pastry sheet.

Top with the other sheet and gently press down to seal everything together.

Brush with the egg and garnish with sesame seeds.

Bake for 6 minutes, then reduce heat to 400F to finish baking 12-15 minutes, until deeply golden brown and flaky. It's best to bake in the middle rack of your oven to prevent any burning. Enjoy!