Heat oil in a deep saucepan over medium heat.
Mix all ingredients for Bang Bang Sauce in a small bowl. Chill until ready to serve.
Add peeled shrimp to a large bowl and cover with buttermilk.
Make a breading station filling one bowl with panko breadcrumbs. In the other bowl add rice flour, garlic powder, onion powder, and salt and pepper.
Dip the buttermilk soaked shrimp in seasoned flour then back into buttermilk then into panko coating shrimp all over.
Bread all shrimp and lay on a plate.
Add 5-6 shrimp at a time to the oil and cook for 2 minutes, until golden brown.
Remove to a paper towel lined plate and repeat with remaining shrimp.
Remove cool Bang Bang Sauce from the fridge, add to a large bowl, and add warm shrimp to the bowl. Toss with tongs until well coated.
Serve garnished with diced green onions with a side of rice or noodles and cucumber salad.