Cook the Pasta: Start by boiling water in a large pot, adding a pinch of salt. Once boiling, add the pasta and cook according to package instructions until al dente. Drain and rinse under cold water to stop the cooking process.
Cook the Shrimp: While the pasta is cooking, heat a large skillet over medium heat. Add a splash of olive oil, and then add the shrimp. Season with salt and pepper. Cook for about 2–3 minutes on each side until the shrimp turn pink and opaque. Remove from heat and let cool.
Combine Ingredients: In a large bowl, combine the cooled pasta, cooked shrimp, cherry tomatoes, cucumber, red bell pepper, and red onion.
Make the Dressing: In a separate small bowl, whisk together the mayonnaise, lemon juice, garlic powder, and dried basil until smooth.
Assemble the Salad: Pour the dressing over the pasta salad mixture and gently toss to coat everything evenly. Adjust seasoning with salt and pepper to taste.
Garnish and Serve: Garnish with fresh parsley, if desired, and serve chilled or at room temperature.