Preheat oven to 400ºF. Line a large baking sheet with parchment paper or 1 teaspoon of olive oil, set aside.
In a small bowl, whisk together egg and 1 tablespoon water.
In a small skillet, on medium heat, sauté onion and pepper in a teaspoon of olive oil until translucent, about 3-5 minutes.
Roll dough into a large rectangle, about 14”x18”. Brush the edges of the dough with the egg water wash. Arrange cheese slices on dough, nearly covering dough and slightly overlapping. Evenly top with meat. Distribute onion/pepper mixture, salt and pepper to taste and if using jalapeños sprinkle them evenly.
On the long side of the dough, roll like a jelly roll. Place the rolled stromboli on the prepared baking sheet. Sprinkle with seasoning and cut 8 slits. Brush the top with the egg water wash.
Bake 25-28 minutes or until golden brown and cheese is melted. Slice and serve. Optional dipping…..Cheese Whiz.