01 - In a medium saucepan, bring the broth to a boil. Stir in couscous, remove from heat, cover, and let stand for 5 minutes.
02 - Fluff couscous with a fork, then stir in Parmesan cheese and 1 tablespoon unsalted butter. Cover to keep warm.
03 - Pat shrimp dry. Season with salt, black pepper, and crushed red pepper flakes if desired.
04 - Heat olive oil and remaining 1 tablespoon butter in a large skillet over medium-high heat. Add garlic and sauté for 30 seconds until fragrant.
05 - Add seasoned shrimp and cook for 2 to 3 minutes per side, until pink and opaque.
06 - Stir in lemon zest and half of the chopped parsley. Remove skillet from heat.
07 - Spoon the Parmesan couscous onto plates, top with sautéed shrimp, and garnish with remaining parsley and lemon wedges.