01 - In a medium saucepan, bring the broth to a boil. Stir in couscous, cover, remove from heat, and let stand for 5 minutes.
02 - Fluff couscous with a fork, then fold in Parmesan cheese and 1 tablespoon butter. Cover and keep warm until serving.
03 - While couscous rests, pat shrimp dry with paper towels. Season both sides with salt, black pepper, and red pepper flakes if desired.
04 - Heat olive oil and the remaining 1 tablespoon butter in a large skillet over medium-high heat. Add garlic and sauté for 30 seconds until aromatic.
05 - Add the shrimp to the skillet in a single layer. Cook for 2 to 3 minutes per side, until the shrimp turn pink and are just cooked through.
06 - Stir in lemon zest and half of the chopped parsley. Gently toss to combine, then remove from heat.
07 - Spoon Parmesan couscous onto serving plates. Top with sautéed shrimp. Garnish with the remaining parsley and lemon wedges.