On a lightly floured surface, roll the dough portions to 1/8-inch thickness. Cut out six rounds, about 4 1/2-5-inches each. Place the rounds on the prepared baking sheet. Spread about 1/2 teaspoon of mustard on each round. Top each one with ham (or veggies) and cheese. Brush the perimeter edges with egg wash. Fold the rounds over and press the edges to seal. Crimp the edges with a fork. Brush the pies with egg wash and sprinkle with Everything Bagel Seasoning. Cut a 1/2-inch ventilation slit into the top of each pie. Bake until golden brown, about 22-25 minutes. Transfer the pies to a cooling rack. Serve warm.