01 - Bring a large pot of salted water to a boil. Cook spaghetti until al dente according to package instructions. Reserve 1/2 cup of pasta cooking water, then drain the pasta.
02 - Pat shrimp dry with paper towels. Season evenly with salt and black pepper.
03 - In a large skillet over medium heat, melt butter with olive oil. Add minced garlic and sliced chilies, sauté for 1 to 2 minutes until fragrant without browning.
04 - Add shrimp in a single layer to the skillet. Cook for 1 to 2 minutes on each side until shrimp turn pink and opaque.
05 - Stir in lemon zest and lemon juice, coating shrimp evenly.
06 - Add drained pasta directly to the skillet. Toss to combine with shrimp and garlic-chili butter. Adjust sauce consistency with reserved pasta water if needed.
07 - Stir in chopped parsley. Taste and adjust seasoning with additional salt, pepper, or lemon juice if desired.
08 - Plate immediately and garnish with extra parsley, grated Parmesan, and lemon wedges as preferred.