In a large skillet, cook sausage for 5-8 minutes; drain. Add the onion, green pepper and butter; cook until vegetables are tender. Add garlic; cook 1 minute longer. Stir in barbecue sauce; heat through.
Unroll crescent roll dough and separate into eight rectangles; seal perforations. Place a cheese slice on half of each rectangle; top with 2 tablespoons sausage mixture.
Fold dough over filling and pinch edges to seal; fold seam under. Beat egg white and water; brush over dough. Sprinkle with sesame seeds.
Place bundles seam side down on greased baking sheets. Bake at 350° for 15-18 minutes or until golden brown.