Position a rack in the lower third of the oven. Preheat oven to 400°F. Line a baking sheet with parchment paper.
Unfold the pastry sheets on a lightly floured surface. Cut each pastry sheet into 4 squares (about 5 inches each).
Spread about 1 ½ teaspoons of apricot preserves in the center of each square (do not spread it all of the way to the edges – leave a border). Divide the ham and cheese evenly in the center of each square.
Fold two opposite corners of each square over the filling to make a pouch; press the edges to seal.
Transfer the pastries to the prepared baking sheet.
Brush the crust of each pastry with egg wash. Season with salt and pepper; sprinkle sesame seeds on top of each crust.
Bake for 13-15 minutes, until the pastries are golden brown. Remove from the baking sheet and cool on a wire rack for 5-10 minutes. Serve warm or at room temperature. Garnish with fresh thyme and a drizzle of honey, if desired.
