In a large skillet, brown ground beef and onion over medium heat until meat is no longer pink; drain. Stir in the green pepper, soup, Worcestershire sauce, salt and pepper; set aside.
On an ungreased baking sheet, separate crescent dough into 2 large rectangles. Join the longer sides together. Press edges and perforations together to form a 12-in. x 7-in. rectangle. Spread half of the meat mixture down the center of the rectangle to within 1-in. of edges. Set aside meat mixture. Fold longer sides of dough over meat mixture to center; seal ends.
Bake at 375° for 15 minutes. Remove from oven and spoon remaining meat mixture down center of loaf. Sprinkle with cheddar cheese; bake 10 minutes longer or until loaf is golden brown and cheese is melted.