In a medium bowl, combine the medium shrimp with olive oil, lemon juice, minced garlic, paprika, red pepper flakes, salt, and pepper. Toss to coat. Let sit for about 10 minutes.

Place a large skillet over medium-high heat, add olive oil and butter, and heat for 1-2 minutes until the butter melts.

Add the marinated shrimp and thinly sliced lemon to the skillet in a single layer. Cook for 2-3 minutes until opaque, then flip and cook for an additional 2-3 minutes.

Sauté until shrimp are fully opaque with a light golden crust. Spoon cooking liquid over shrimp if desired.

Transfer to a serving dish and garnish with fresh parsley. Serve immediately over rice, pasta, or alongside a salad.