Thaw shrimp, if frozen. Peel and devein shrimp. In a medium mixing bowl combine lemon juice, chili powder, cumin, and pepper; add shrimp. Toss to coat. Let shrimp stand for 20 minutes at room temperature, stirring occasionally.

Meanwhile, in a large saucepan bring water to boiling. Stir in 1 noodle flavor packet (reserve remaining flavor packet for another use) and the broken noodles. Return to boiling and cook 1 minute. Add the shrimp and cook for 1 to 2 minutes more or until shrimp turn pink. Stir in salsa, beans, corn, snipped cilantro, and green onion. Heat through. To serve, top each serving with cheese and garnish with cilantro, if desired. Makes 4 to 6 servings.

Peel and devein shrimp; cover tightly and refrigerate up to 2 hours before using.