01 -
Place frozen white bread dough in a lightly greased bowl; cover with plastic wrap. Leave in a warm spot until fully thawed and doubled in size, approximately 2 to 3 hours.
02 -
Dice bell pepper and onion; thinly slice mushrooms. Heat 1 tablespoon butter in a skillet over medium heat. Sauté vegetables until softened and lightly browned, about 6 minutes. Remove from heat and let cool slightly.
03 -
Preheat oven to 375°F (190°C). Line a baking sheet with parchment paper or lightly grease to prevent sticking.
04 -
On a floured surface, roll out the risen dough into a 12 by 18 inch (30 by 45 cm) rectangle with even thickness, taking care not to tear.
05 -
Combine mayonnaise and garlic powder in a small bowl; mix well. Spread evenly over the dough, leaving a 1.27 cm (1/2 inch) border around edges.
06 -
Arrange sliced roast beef evenly over the spread. Distribute sautéed vegetables on top, followed by layered provolone slices, slightly overlapping.
07 -
Starting from a long edge, roll the dough tightly like a jelly roll, tucking in fillings as necessary. Pinch seams and ends to seal completely.
08 -
Place the roll seam side down on the prepared baking sheet. Melt remaining 1 tablespoon butter and brush over the top. Sprinkle evenly with garlic salt, sesame seeds, and dried parsley.
09 -
Bake for 15 to 20 minutes or until golden brown and internal temperature reaches 165°F (74°C).
10 -
Allow the stromboli to rest for 5 minutes to firm up. Slice with a serrated knife and serve warm.