Preheat oven to 350℉ and line a rimmed sheet pan with parchment paper. (I recommend using a rimmed sheet pan so none of the juices overflow to the bottom of your oven.)
Place a large skillet over medium-high heat.
Add the oil then sauté the onions and peppers for 8-10 minutes, stirring frequently until tender.
1 teaspoon vegetable oil, 1 cup yellow onion slices, 1 cup green bell pepper slices
Add the beef, stirring occasionally until cooked through.
1 14-ounce box frozen Philly cheesesteak meat
Stir in the beef bouillon and seasoned salt; remove from the heat.
1 beef bouillon powder, 1/2 teaspoon seasoned salt
If you notice some grease/juices pooling in the bottom of the pan, I highly recommend draining it so you don't have a soggy braid!
Roll out the thawed bread dough and press into a large rectangle.
1 pound frozen bread dough
Use a pizza cutter to cut each side of the braid into about 12 strips.
Place four slices of provolone cheese down the center.
8 slices provolone cheese
Spoon the beef mixture on top of the cheese and finish with the four remaining cheese slices.
Fold the strips of dough over the filing, alternating sides.
In a small bowl, whisk together the egg yolk and 1 tablespoon of water; brush the egg wash over the dough.
1 egg yolk, 1 tablespoon water
Bake for 22-24 minutes, or until golden brown on top.