Heat a nonstick pan over medium-high heat. Add steak and cook and stir until no longer pink. Remove from pan and set aside on a paper towel-lined plate. Discard grease in pan.
Add butter to the pan and cook onion and green pepper until softened. Add in Worcestershire sauce and garlic powder.
Transfer onion and peppers to the paper towel-lined plate with the steak.Season meat and onion and green pepper to taste with salt and pepper. Let cool.
Preheat oven to 350 degrees.
Unroll crescent dough on a lighlty greased baking sheet or a baking sheet lined with parchment paper.
Stretch the dough into rectangle that is about 8 inches wide.
Place a 3-inch stirp of meat, onions, and peppers down the center of the dough.
Lay the cheese slices over the meat mixture.
Make cuts just to the edge of the filling on the long sides of the dough about 1 inch apart.
Fold strips at an angle, alternating from side to side. Brush dough with the egg.