Heat oven to 375°F.
If using crescent rolls: Unroll dough in ungreased 13x9-inch pan. Press in bottom and 1/2 inch up sides. Firmly press perforations to seal. If using dough sheet: Unroll dough in ungreased 13x9-inch pan. Press in bottom and 1/2 inch up sides.
Wrap beef tightly in foil. Place dough and beef in oven.
Bake about 10 minutes or until crust is light golden brown. Arrange warm beef over partially baked crust. Brush with dressing. Sprinkle with cheese.
Bake 8 to 10 minutes longer or until edges of crust are golden brown and cheese is melted. Meanwhile, in 8-inch skillet, heat oil over medium heat until hot. Add bell pepper, onions and bouillon; cook and stir 3 to 5 minutes or until tender. Spoon cooked vegetables over melted cheese.