Rinse the shrimp under cold water and pat dry. Toss with garlic powder, paprika, salt, and black pepper.
Mix mayonnaise, sweet chili sauce, and sriracha in a bowl to make the bang bang sauce.
Preheat oven to 400°F. Set up a breading station with flour, beaten egg, and panko breadcrumbs. Dredge shrimp in flour, dip in egg, and coat with breadcrumbs. Bake for 12-15 minutes until golden brown.
Warm tortillas in a skillet for 30 seconds on each side. Assemble tacos with cabbage, shrimp, bang bang sauce, and green onions. Serve with lime wedges.