01 -
Place the frozen white bread loaf into a greased bowl, cover tightly with plastic wrap, and let rise in a warm area until fully thawed and doubled in size, approximately 2 to 3 hours.
02 -
Dice the green bell pepper and yellow onion evenly. Thinly slice the mushrooms. In a skillet over medium heat, melt 1 tablespoon of butter, then sauté the vegetables until soft and lightly browned, about 6 minutes. Remove from heat and allow to cool slightly.
03 -
Preheat the oven to 375°F. Line a baking sheet with parchment paper or grease lightly to prevent sticking.
04 -
On a lightly floured surface, roll the risen dough into a rectangle approximately 12 by 18 inches, ensuring an even thickness without tearing.
05 -
Combine the mayonnaise and garlic powder in a small bowl, mix until smooth, then spread evenly across the dough, leaving a 1/2 inch border.
06 -
Arrange the roast beef slices evenly over the mayo spread. Scatter the sautéed vegetables on top, followed by overlapping slices of provolone cheese.
07 -
Starting at one long edge, roll the dough tightly into a log shape, tucking in fillings as needed. Pinch seams and ends firmly to seal.
08 -
Place the roll seam-side down on the baking sheet. Melt the remaining tablespoon of butter and brush generously over the top. Sprinkle the garlic salt, sesame seeds, and dried parsley evenly.
09 -
Bake in the preheated oven for 15 to 20 minutes until the crust is golden brown and the internal temperature reaches 165°F.
10 -
Allow the stromboli to rest for 5 minutes to set, then slice with a serrated knife and serve warm.