01 - Bring a large pot of salted water to a boil. Cook angel hair pasta according to package directions until al dente. Reserve 1/2 cup pasta water, then drain and set aside.
02 - Pat shrimp dry and season lightly with salt and pepper.
03 - In a large skillet over medium-high heat, melt 2 tbsp butter with olive oil. Add shrimp in a single layer. Cook for 1-2 minutes per side, until pink and opaque. Remove shrimp and set aside.
04 - In the same skillet, lower heat to medium. Add remaining 2 tbsp butter and minced garlic. Sauté for 1 minute until fragrant, but not browned.
05 - Add lemon zest, lemon juice, and red pepper flakes. Stir, then return shrimp to the skillet.
06 - Add cooked pasta to the skillet, tossing gently to coat. If needed, add reserved pasta water, a little at a time, until sauce reaches desired consistency.
07 - Stir in chopped parsley. Taste and adjust seasoning with salt and pepper.
08 - Serve immediately, garnished with lemon wedges and extra parsley.