01 - Heat 1 tbsp vegetable oil in a large skillet or wok over medium-high heat. Add minced garlic and grated ginger, sauté for 30 seconds until fragrant.
02 - Add shredded cabbage, carrots, sliced shiitake mushrooms, and bell pepper. Stir-fry for 2-3 minutes until slightly softened.
03 - Add bean sprouts and sliced green onions. Stir-fry for another minute until just wilted.
04 - Stir in soy sauce, oyster sauce, sesame oil, and white pepper. Cook for 1-2 minutes until vegetables are tender-crisp. Transfer to a colander, cool completely, and press gently to remove excess moisture.
05 - Place wrapper with corner facing you. Add 2 tbsp filling near bottom corner. Fold corner over filling, fold in sides, roll tightly. Seal edge with flour-water paste. Repeat with remaining wrappers.
06 - Heat 2 inches vegetable oil in deep skillet to 350°F. Fry spring rolls in batches for 3-4 minutes, turning occasionally, until golden brown and crispy.
07 - Remove with slotted spoon and drain on paper towels. Serve immediately with sweet chili sauce or soy sauce for dipping.