Heat a skillet over medium-high heat. Add the shrimp to a large bowl with 1 tablespoon of olive oil, lemon zest and lemon juice, followed by kosher salt, Italian seasoning, black pepper, garlic powder, onion powder, smoked paprika, and red pepper flakes. Toss to combine and coat well.
1.5 pounds jumbo shrimp, 3 tablespoons olive oil, 1.5 tablespoons lemon juice, 1 tablespoon lemon zest, 1.5 teaspoons kosher salt, 1 teaspoon Italian seasoning, ½ teaspoon black pepper, ½ teaspoon garlic powder, ½ teaspoon onion powder, ½ teaspoon smoked paprika, ¼-1/2 teaspoon red pepper flakes