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Spread the steak and vegetable mixture evenly over the dough, leaving about 1 inch around the edges. Sprinkle the provolone and mozzarella cheese over the top of the filling.
Roll the Dough
Starting from one long side, carefully roll the dough over the filling, tucking it in as you go to create a tight roll. Pinch the edges to seal, and place the seam side down on a baking sheet lined with parchment paper.
Egg Wash and Garnish
Brush the top of the rolled stromboli with the beaten egg. If desired, sprinkle sesame seeds over the top for added flavor and texture.
Bake
Bake in the preheated oven for 20-25 minutes or until the dough is golden brown and cooked through.
Cool and Serve
Remove from the oven and let it cool for about 5 minutes before slicing. Serve warm with marinara sauce or your favorite dipping sauce on the side.
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