In a large skillet, cook pork over medium heat until no longer pink; drain. Stir in the bean sprouts, bamboo shoots, shrimp, mushrooms and onions.
In a small bowl, whisk the cornstarch, soy sauce, water, garlic powder and oil until smooth; stir into skillet. Bring to a boil; cook and stir for 1 minute or until thickened. Remove from the heat.
Position a wonton wrapper with one point toward you. (Keep remaining wrappers covered with a damp paper towel until ready to use.) Place 2 heaping teaspoons of filling in the center of wrapper. Fold bottom corner over filling; fold sides toward center over filling. Roll toward the remaining point. Moisten top corner with water; press to seal. Repeat with remaining wrappers and filling.
In an electric skillet or deep-fat fryer, heat oil to 375°. Fry spring rolls, a few at a time, for 1-2 minutes on each side or until golden brown. Drain on paper towels. Serve warm with sweet-and-sour sauce. Yield: about 5 dozen.