Vietnamese rice paper wrappers (also called báhn tráng) are easy to work with once you’ve moistened one or two and gotten a feel for how they soften up. You can also serve these wraps as appetizers by slicing them in half on the bias and serving them standing pointy-end up.
1. Combine avocado, lime juice, and lime zest in small bowl. Stir in bell pepper, cream cheese, green onions, cilantro, and chile sauce; set aside.
2. Fill large bowl (9-inch diameter) with warm water. Submerge 1 rice paper wrapper 10 seconds in water, or just until it becomes soft. Remove wrapper to flat work surface, and let rest 30 seconds; it will become more pliable.
3. Spoon scant ¼ cup avocado mixture just below middle of rice paper wrapper, leaving 1-inch border on either side. Top with ¼ cup alfalfa sprouts and 2 to 3 mango slices. Fold bottom of rice paper wrapper up over filling, pressing filling as you go. Fold both sides of rice paper inward. Gently press to seal. Roll up wrapper to top edge. Brush water on top edge, if necessary, to seal. Repeat with remaining wrappers, avocado, sprouts, and mango.