01 - Cook pasta in a large pot of salted boiling water according to package directions until al dente. Drain and rinse thoroughly under cold water to halt the cooking process. Set aside.
02 - In a small bowl, whisk together mayonnaise, sour cream, white wine vinegar, Dijon mustard, salt, and freshly ground black pepper until well combined to create the dressing.
03 - Divide the cooked and cooled pasta into three separate mixing bowls, ensuring an even distribution.
04 - Add the drained corn kernels and diced yellow bell pepper to one bowl of pasta. Toss gently to evenly coat the pasta, creating the yellow layer.
05 - Introduce the finely diced baby carrots and diced orange bell pepper to the second bowl of pasta. Toss to combine, forming the orange layer.
06 - Gently add the mozzarella pearls to the third bowl of pasta. Toss carefully to incorporate the cheese without breaking the pearls, establishing the white layer.
07 - In a clear trifle bowl or glass serving dish, artfully layer the pasta mixtures: begin with the yellow pasta mixture at the bottom, followed by the orange pasta mixture in the middle, and finish with the white pasta and mozzarella mixture at the top.
08 - Just before serving, drizzle the prepared dressing evenly over the top of the layered salad, or serve it on the side for individual preference.
09 - Sprinkle with chopped fresh parsley and optional decorative Halloween elements for festive presentation.