Preheat oven to 375F (190C).

Thaw phyllo dough.

Melt butter.

Layer 4-5 sheets of phyllo dough on a flat surface, brushing butter between each sheet.

Cut the layered phyllo into 6 equal squares.

In the center of each square, place 1-2 teaspoons of softened cream cheese.

Top the cream cheese with 1-2 tablespoons of chopped pastrami.

Fold the ends and corners of each square over into the center.

Brush the top and bottom of each package with melted butter to seal.

Place the folded packages seam-side down on a baking sheet.

Repeat steps 4-9 until all ingredients are used.

Bake for 12-15 minutes, or until golden brown.

Serve hot with spicy or stone ground mustard for dipping.

These can be made ahead and frozen before baking.

To reheat frozen packages, thaw and bake in the oven until heated through.