How to Make It
Preheat oven to 400°F with oven rack 5 to 6 inches from heat source. Heat 2 tablespoons of the oil in a large ovenproof skillet (with a lid) over medium-high. Add onion, and cook until translucent, about 5 minutes. Add tomatoes, garlic, oregano, 3/4 teaspoon salt, and 1/4 teaspoon pepper; cook until tomatoes are softened, about 2 minutes. Stir in broth and orzo; bring to a boil, stirring occasionally. Cover and bake until orzo is tender and liquid is mostly absorbed, about 15 minutes. Remove from oven; increase temperature to broil.
Toss shrimp with remaining 1 tablespoon oil, 1/2 teaspoon salt, and 1/4 teaspoon pepper; arrange shrimp on orzo. Combine panko, Parmesan, butter, and lemon zest; sprinkle over shrimp and orzo. Return to oven; broil, uncovered, until shrimp are opaque, 4 minutes. Garnish with parsley and lemon wedges.