While it’s heating, melt butter in a small pot over medium heat. Add garlic and cook for a minute. Add chopped herbs and turn off heat, swirling to combine. Set aside.
Combine salt, garlic powder, and blackening seasoning.
Lay shrimp on foil-lined baking tray. Top shrimp with half of the seasoning mix, flip and season the other side.
Broil shrimp, 2-3 minutes per side.
Pour herbed butter over shrimp. Serve immediately.