Step 1: Cook the Fettuccine - Bring a large pot of salted water to a boil. Add the fettuccine pasta and cook according to package instructions until al dente, about 8-10 minutes.
Step 2: Prepare the Corn - While the pasta is cooking, microwave the frozen corn according to package instructions or sauté in a skillet over medium heat until warmed through.
Step 3: Drain and Cool - Once the pasta is done cooking, drain in a colander and rinse under cold water to stop the cooking process.
Step 4: Mix the Ingredients - In a large mixing bowl, combine the cooled fettuccine, thawed corn, mayonnaise, grated Parmesan cheese, garlic powder, cracked pepper, and salt. Stir well until all ingredients are evenly incorporated.
Step 5: Chill and Serve - For the best flavor, cover and refrigerate for at least 30 minutes before serving. Serve chilled.