If using frozen shrimp, thaw for about 10-15 minutes in cold water before using. While waiting, combine dried spices (minus salt and pepper) in a small bowl. Set aside.
In a cast iron skillet, add olive oil and garlic to a cold pan. Turn heat to medium-low, and cook garlic for 2-3 minutes, or until garlic is softened, but not brown. Remove garlic from the pan and set aside.
Turn heat up to high. Wait for a minute to allow pan to come to temperature.
Season raw shrimp lightly with salt and pepper.
Add shrimp and sear on each side, about 1 minute per side. Shrimp should quickly become pink with light brown sear-marks.
Toss in spice mixture, cooked garlic, and about half of the parsley. Stir briefly; about 30 seconds more. Season with additional salt and pepper as needed (to taste).
Remove from heat.
Serve in the cast iron skillet, or remove to a serving dish. Top with the remaining parsley.
Serve with toasted french bread.