In a bowl, add milk, pepper, garlic powder and cajun seasoning.
Mix the cornstarch and old bay seasoning.
Heat oil in a deep pan until the oil reaches 350 degrees F.
Remove shrimp from the milk mixture and dredge in the cornstarch mixture on each side.
Fry shrimp, until brown and crispy on each side -- approx. 3 minutes
Add to a plate lined with a paper towel to drain the excess oil.
To make the sauce, mix the mayo, chili sauce, sriracha and chili paste in a bowl.
Heat a frying pan on medium heat. Add butter to each side of the tortilla and grill on both sides to warm.
Assemble the tacos with lettuce and any other toppings you would like. Add the shrimp and top with sauce. Enjoy!