Roughly chop the cooked shrimp and set aside.
In a small bowl, mix together the dried seasons: salt, black pepper, garlic powder, onion powder, chili powder, paprika and red pepper flakes (or cayenne pepper).
Toss the chopped shrimp with the dried spice mixture.
Add the olive oil to a frying pan placed over medium heat.
Stir in the minced fresh garlic, and cook until fragrant, approximately 1 minute.
Stir in the spice coated shrimp and cook for a few minutes, until heated through. If using fresh, raw shrimp adjust your cooking time until the shrimp is cooked through.
Stir in the tomato sauce and cook for 1 or 2 more minutes, or until the sauce is heated through.
Remove the pan from the stove, and place the Cajun Shrimp into a serving bowl.
Sprinkle the shrimp with the chopped chives.
Serve the spiced shrimp as-is, or on top of noodles, rice or a baked potato.
For an extra punch of flavor, toss in a few cherry tomatoes that you've sliced in half - enjoy!