Cook the Pasta: Bring a large pot of salted water to a boil. Cook pasta according to package directions until al dente. Reserve ¼ cup of pasta water, then drain and set aside.
Make the Sauce: In a large skillet over medium heat, melt the butter. Add the chopped onion and sauté for 2–3 minutes until soft. Stir in the minced garlic and cook for 1 minute until fragrant. Add salt, black pepper, chili flakes, oregano, and basil. Stir well.
Add Lemon & Parsley: Stir in lemon zest and juice. Let it simmer for 1 minute. Add chopped parsley and stir to combine.
Combine Pasta & Cheese: Add the cooked pasta to the skillet and toss to coat. Pour in the reserved pasta water gradually to loosen the sauce. Stir in grated Parmesan until melted and creamy.
Serve: Taste and adjust seasoning if needed.Garnish with extra parsley and Parmesan before serving.Serve warm with lemon wedges on the side.
