01 -
Heat 2 tablespoons of butter in a large skillet over medium heat. Add the diced onion and bell pepper and cook for 6 to 7 minutes until they're softened and slightly caramelized. Season with the garlic powder, onion powder, salt, and pepper. Remove from the skillet and set aside.
02 -
Add the remaining tablespoon of butter to the same skillet and increase the heat to medium-high. Add the chopped Steak-Umm and season with steak seasoning. Cook for 3 to 4 minutes, breaking it up as it cooks, until fully browned.
03 -
Transfer the cooked meat to a paper towel-lined plate and let it drain thoroughly to remove excess grease - this is important so your stromboli doesn't get soggy!
04 -
Return the meat to the skillet and add the cooked peppers and onions back in. Stir to combine and then let the mixture cool completely before assembling - hot filling will melt the cheese and make the dough soggy.
05 -
Preheat your oven to 425 degrees. Roll the pizza dough into a large rectangle on a sheet of parchment paper - aim for about 12x15 inches.
06 -
Arrange the provolone cheese slices evenly over the dough, leaving about a 1-inch border around all the edges so you can seal it later.
07 -
Spread the cooled meat and vegetable mixture over the provolone cheese. Top with the shredded mozzarella cheese.
08 -
Using the parchment paper to help you, carefully roll the dough into a tight log shape, starting from one long side. Pinch the seams and both ends tightly to seal in all that cheesy goodness.
09 -
Transfer the stromboli (still on the parchment) to a baking sheet, seam-side down. Brush the top generously with melted butter, then sprinkle with dried parsley and sesame seeds. Cut 3 to 4 diagonal slits across the top to allow steam to escape.
10 -
Bake for 20 minutes, or until the stromboli is golden brown and the dough is cooked through.
11 -
While the stromboli is baking, prepare the au jus according to the package directions using 1 cup of water. When the stromboli is done, let it rest for 5 minutes before slicing. Serve with the warm au jus for dipping - it's amazing!