Preheat oven to 400°F. Line baking sheet with parchment.
Sauté onions and peppers until soft (7-8 min). Add garlic for 30 seconds. Remove.
Cook sliced steak with seasonings until just done (2-3 min).
Roll dough into 14×10 inch rectangle on floured surface.
Layer down center: half provolone, steak, vegetables, remaining cheese.
Fold dough over filling, pinch seams to seal.
Transfer to baking sheet seam-side down.
Brush with egg wash, cut slits for venting, add sesame seeds if desired.
Bake 20-25 minutes until golden.
Rest 5-10 minutes before slicing and serving.
