If using frozen shrimp, make sure they are completely thawed. Rinse and pat dry with paper towels.
In a bowl, toss the shrimp with olive oil, minced garlic, lemon juice, salt, black pepper, and paprika. Add red pepper flakes if you like it spicy.
Heat your Blackstone griddle to medium-high heat. A properly heated griddle is key for a good sear.
Once hot, lay the shrimp in a single layer on the griddle.
Cook for 2–3 minutes on each side, until the shrimp turn pink and curl slightly.
Toward the end of cooking, add a few dollops of butter to the griddle and let the shrimp sauté in the melting butter.
Sprinkle with freshly chopped parsley.
Serve hot, on their own or with your favorite sides.