Combine heavy cream, salt, onion powder and garlic powder in a bowl. Add raw shrimp. Let sit for at least 10 minutes (up to 30 minutes), covered in the refrigerator.
Combine sauce ingredients and let rest while cooking shrimp.
In a large frying pan over medium high heat, add enough oil to be ½ inch deep. Add cornstarch to a bowl.
Once oil is hot, prepare to fry the shrimp in batches. Remove a third of the shrimp from the cream marinade and add to cornstarch. Toss until evenly coated then add shrimp to hot oil in a single layer. Fry for 90 seconds on each side. Then remove to a wire rack. Repeat with remaining shrimp.
To build the taco, start with tortilla, then add portion of cabbage and red onions. Add three or four pieces of shrimp and drizzle with bang bang sauce and sprinkle with cilantro. Serve two or three tacos per person.
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