Cook the pasta: Boil in well-salted water until just al dente.
You want a little bite so it doesn’t turn mushy later.
Cool it fast: Drain, rinse under cold water to stop the cooking, and shake off excess water. Spread on a sheet pan to cool completely.
Crisp the bacon: Cook until deeply golden and crisp. Drain on paper towels and crumble when cool.
Prep the veggies: Halve tomatoes, dice cucumber and bell pepper, and finely chop red onion and herbs.
Keep pieces bite-size and even.
Mix the dressing: In a bowl, whisk Greek yogurt, ranch seasoning, lemon juice, a splash of olive oil, and vinegar if using. Taste and season with salt and pepper. If you like extra creaminess, stir in the mayo.
Combine: In a large bowl, add cooled pasta, veggies, cheese, and most of the bacon.
Pour over the dressing and toss until everything is well coated.
Chill: Cover and refrigerate at least 30 minutes so flavors meld. The pasta may soak up dressing, so keep a little extra yogurt and lemon handy to loosen before serving.
Finish and serve: Toss, adjust seasoning, and top with the remaining bacon and fresh herbs. Serve cold.