Bring a large pot of salted water to a rolling boil. Add the linguine or spaghetti and cook according to package instructions until al dente. Drain, reserving 1/2 cup of the pasta water. Set aside.
In a large skillet, melt 2 tablespoons of butter over medium heat. Once melted, add the minced garlic and sauté for about 1 minute until fragrant, being careful not to burn it.
Increase the heat to medium-high and add the shrimp to the skillet. Cook for 2-3 minutes on one side until they start to turn pink. Flip the shrimp over and cook for another 2-3 minutes.
Add the red pepper flakes, oregano, lemon zest, and lemon juice to the skillet. Stir well to combine. Pour in the chicken broth and let it simmer for about 2 minutes to blend the flavors.
Add the remaining 2 tablespoons of butter to the shrimp mixture and stir until melted. Toss in the cooked pasta, mixing well to coat the noodles with the sauce. If needed, add reserved pasta water a little at a time until the desired sauciness is achieved.
Season with salt and black pepper to taste. Remove from heat, sprinkle with fresh parsley, and toss to combine.
Serve the scampi in bowls, and garnish with lemon slices on the side for an extra touch of freshness.
Notes
Adjust red pepper flakes to taste for spice level.