On a lightly floured board, roll pizza dough out into 2 (7-inch) rounds about 1/4-inch thick.

Spoon 1 cup of chocolate cubes into center of each round.

Brush the edges of the dough with beaten egg and fold each round in 1/2. Fold edges and press to seal completely. Brush with egg. Slide chocolate calzone into oven and bake for 30 minutes or until golden brown.