In a large pot of salted boiling water, add the pasta. Cook according to package instructions. Drain and rinse the pasta with cold water. Drain the pasta well after rinsing.: When you drop the pasta into actively boiling water you should hear a lively simmering and see the strands or shapes float then sink, moving freely. The salt seasons the pasta from the inside out, and the water should taste mildly salty like the sea. A common mistake is under salting the water which leaves the final salad flat. If the water is not at a rolling boil, the pasta can become gummy, so wait until the surface bubbles vigorously before adding it.
In a large bowl, combine the pasta, bell peppers, tomatoes, and olives. Add the dressing and stir until pasta noodles and vegetables are well coated.: As the pasta cooks, watch for the texture to shift from stiff to springy, and test it a minute or two before the lower bound of the package time. Al dente pasta will feel slightly resistant to the bite yet tender. Overcooking will make it limp and more likely to absorb too much dressing. If you are unsure, sampling a piece gives you the most reliable cue.
Stir in the basil and Parmesan cheese. Season with salt and black pepper, to taste. Serve at room temperature or cold.: After cooking, pour the pasta into a colander and run cold water over it until the steam subsides and the pieces feel cool. The rinse stops the cooking and removes surface starches that can make the salad gummy. Be cautious not to over rinse if you want a bit of sauce adhesion, otherwise the dressing may slide off.
Drain the pasta well after rinsing: Let the pasta sit for a minute in the colander so excess water can drip away, or gently shake in short bursts. If too much water remains, the dressing will dilute and the salad will become watery. A common oversight is to skip this rest, which can make the bowl thin in flavor.
In a large bowl, combine the pasta, bell peppers, tomatoes, and olives: When you fold these elements together you should notice a chorus of textures the moment they meet, the crispness of peppers alongside the juicy pop of tomatoes. Use a wide bowl so you can toss without crushing the tomatoes, and aim for even distribution so each forkful is balanced. Pressing too hard while tossing will bruise the vegetables, so be gentle.
Add the dressing and stir until pasta noodles and vegetables are well coated: Pour the Italian dressing over the combined ingredients and slowly fold it in with a large spoon or spatula. You want glossy, lightly shiny surfaces on the pasta and vegetables rather than pools of dressing. If you add too much dressing at once, the salad can become oily; add a bit, taste, then adjust. A common misstep is overdressing early on, which is harder to correct than adding more later.
Stir in the basil and Parmesan cheese: Add the chopped basil and freshly grated Parmesan cheese , folding gently so the herb remains vibrant and the cheese starts to cling to the pasta . The aroma of basil should lift instantly, and the cheese will add savory depth. If you mix vigorously the basil can wilt and lose its brightness, so incorporate with soft strokes.
Season with salt and black pepper, to taste: Finish by tasting and adjusting with Kosher salt and freshly ground black pepper . Salt intensifies other flavors while pepper adds a warming note. Add cautiously and taste after each small addition, because the Parmesan cheese and black olives already contribute saltiness. Over salting is a frequent error and is difficult to reverse.
Serve at room temperature or cold: This salad presents well either slightly chilled or at room temperature; the flavors open up as it rests. If serving cold, let it sit in the fridge for a little while so the dressing melds with the pasta . A common issue is serving too cold immediately from the fridge which can mute flavors, so allow a short tempering time if possible.