Cook the pasta right: Boil in salted water until just al dente. You want a slight bite so it holds up to the dressing.
Drain and rinse under cool water to stop the cooking and chill it down.
Crisp the bacon: Cook until deeply golden and crunchy. Drain on paper towels and crumble. Reserve a teaspoon of bacon fat if you want to add extra smoky flavor to the dressing.
Prep the chicken: Shred rotisserie chicken, or dice grilled or baked chicken.
Aim for bite-size pieces so you get some in every forkful.
Whisk the dressing: In a bowl, combine ranch, BBQ sauce, mayonnaise, lemon juice, smoked paprika, garlic powder, pepper, and cayenne if using. Taste and adjust. Add a pinch of salt only if needed—BBQ and ranch can be salty.
Toss the base: In a large bowl, add cooled pasta, chicken, corn, tomatoes, red onion, and half the green onions.
Pour in most of the dressing and toss gently to coat.
Add the crunch and cheese: Fold in bacon and shredded cheese. Save a little bacon for topping, so it stays crisp.
Chill to meld flavors: Cover and refrigerate for at least 30–60 minutes. The pasta will absorb some dressing, and flavors will round out.
Finish and serve: Stir, then add a splash more dressing if it looks dry.
Top with remaining green onions, extra bacon, and herbs. Drizzle a bit of BBQ sauce and ranch for that deli-case look, if you like.