01 -
Place frozen white bread dough in a greased bowl, cover with plastic wrap, and let rise in a warm area until fully thawed and doubled in size. This typically takes 3 to 4 hours.
02 -
Dice bell pepper and onion, and thinly slice mushrooms. Melt 1 tablespoon butter in a skillet over medium heat. Sauté the vegetables until softened and lightly browned, about 6 minutes. Let cool slightly.
03 -
Heat oven to 375°F. Line a baking sheet with parchment paper or spray with nonstick cooking spray.
04 -
On a lightly floured surface, roll the risen dough into a rectangle measuring approximately 12 x 18 inches, keeping the thickness as even as possible.
05 -
In a small bowl, combine mayonnaise and garlic powder. Mix thoroughly then spread evenly over the surface of the dough, leaving a 1/2-inch border on all edges.
06 -
Arrange roast beef slices evenly over the mayonnaise spread. Evenly scatter sautéed vegetables across the meat. Top with provolone slices, overlapping as needed.
07 -
Starting at a long edge, roll the dough tightly into a log, keeping the filling secure. Pinch seam and ends to seal, then place seam-side down on prepared baking sheet.
08 -
Melt remaining 1 tablespoon butter and brush it over the top of the roll. Sprinkle surface with garlic salt, sesame seeds, and dried parsley.
09 -
Bake for 15 to 20 minutes or until the crust is golden brown and internal temperature reaches 165°F.
10 -
Let stromboli rest for 5 minutes to allow the fillings to set. Slice with a serrated knife and serve warm.