Add diced pancetta, stirring occasionally until golden and crispy, about 10 minutes.
Transfer pancetta (without fat) onto a paper towel, set aside.
With a rolling pin, roll the puff pastry out onto a floured surface to about 1/8-inch thick (3 mm), forming a rectangle roughly 18 x 12-inches (46 x 30 cm).
Cut the puff pastry into 4 x 4-inch squares (10 x 10 cm).
Brush squares with beaten egg.
Fold the four corners of each square toward the inside creating an edge about ¼-inch (6 mm).
Brush edges with beaten egg.
Garnish the inside of each square with a slice of brie, pancetta, almonds, dried fruit, and sage. Season with salt and pepper.
Transfer bites onto a baking sheet lined with parchment paper.
Bake for 15 minutes or until puff pastry is golden brown and cheese has melted.