Preheat oven to 400 degrees F. Line a baking sheet with parchment.
Thaw and roll out your puff pastry into (about) a 12x12’’ square. Place on the baking sheet.
Spread the Fig Pancetta Jam (or other savory jam) onto the puff pastry, leaving about a 1’’ boarder.
Brush with the egg wash, then top with 1 cup of shredded Gruyere cheese then fold the sides up and over 2-3’’. Sprinkle with the Parmesan cheese, dusting the edge of the tart as well as the center, and fresh cracked pepper.
Garnish with thyme sprigs and bake on the center rack for 20-25 minutes, rotating 3/4 of the way through, until puffed and golden.
Allow to cool for 10 minutes, then quarter the tart and serve warm as an appetizer or a side dish.